Trailer Life Magazine Open Roads Forum: Question re: GCWR - Loaded Vehicle Weight = Tow Capacity
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 > Question re: GCWR - Loaded Vehicle Weight = Tow Capacity

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LarryJM

NoVa

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Joined: 11/09/2007

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Posted: 11/05/09 04:43pm Link  |  Print  |  Notify Moderator

BenK wrote:


If I take the 7,400 + 10,000 MTWR = 17,400. Which is way more than the 16,000
GCWR. Then if I do load up to the 8,600 GVWR + 10,000 = 18,600...even more than
the 16,000 GCWR.


That to me the above partial quote is Voodo math since you are taking what your actual vehicle weighs with the tool box, etc. and adding it to the MTWR which is typically calculated on a very are bones vehicle with minimum cargo on board and then comparing it to the GCWR.

Also, trying to add the GVWR of your TV to the MTWR for your vehicle again is Voodo math since that is IMHO a gross mis understanding of what the GVWR and MTWR for you vehicle are based on. The MTWR in no way uses the GVWR of the TV but something that is much, much less to give put the TV capabilities in the best light. Maybe with the TV with only that skinny 150lb driver and 10 gal of fuel and nothing else ... passengers, cargo.

This math almost sounds like the logic used in Obama Health Care ... the numbers are skewed to try and make a point w/o merit.

Your example I quoted IMHO has mixed apples and oranges and then compared that to pears.

Larry


2001 standard box 7.3L E-350 PSD Van with 4.10 rear and 2007 Holiday Rambler Aluma-Lite 8306S Been RV'ing since 1974.
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GBlack

Evansville, Indiana

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Posted: 11/05/09 04:46pm Link  |  Print  |  Notify Moderator

Actually I'm still trying to find the published GCWR. Believe it or not, I called two different people at Toyota's 1-800 number and nobody could tell me (after checking with "other" people there also). They finally told me to ask my local dealer (which I did and am waiting for a reply). Supposedly Toyota's "Customer Care" department (1-800 number) doesn't talk to their engineers. And GCWR is not on the door sticker, in the manual, or even in the Toyota Towing Guide. The only number I could find was on ToyotaNation internet forum where somebody said the GCWR was 11000 lbs. But since that's an AWD, I reduced my estimate to 10800 lbs since the GVWR of my FWD Highlander is 200 lbs less (5800 lbs) than the AWD Highlander (6000 lbs). I cannot believe that finding a simple GCWR number is so complicated.

lrak

MA

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Posted: 11/05/09 05:29pm Link  |  Print  |  Notify Moderator

skipnchar wrote:

Apparently Toyota is "moving forward" again and has changed the means of establishing tow ratings


They have been doing it this way for at least 25 years. The change is lying the same way as the big three with the current generation Tundra. LoL.

LarryJM

NoVa

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Posted: 11/05/09 05:47pm Link  |  Print  |  Notify Moderator

GBlack wrote:

Actually I'm still trying to find the published GCWR. Believe it or not, I called two different people at Toyota's 1-800 number and nobody could tell me (after checking with "other" people there also). They finally told me to ask my local dealer (which I did and am waiting for a reply). Supposedly Toyota's "Customer Care" department (1-800 number) doesn't talk to their engineers. And GCWR is not on the door sticker, in the manual, or even in the Toyota Towing Guide. The only number I could find was on ToyotaNation internet forum where somebody said the GCWR was 11000 lbs. But since that's an AWD, I reduced my estimate to 10800 lbs since the GVWR of my FWD Highlander is 200 lbs less (5800 lbs) than the AWD Highlander (6000 lbs). I cannot believe that finding a simple GCWR number is so complicated.


I can understand your frustration since the GCWR is more of a performance/warranty number within some limits and some manufacturers might think it not needed if they give the GVWR and the MTWR with it's conditions on it being less for a fully loaded vehicle. A thousand or so lbs delta is IMHO not a big problem, but with some the the heavier duty vehicles they want to give unrealistic tow capabilites so the delta is more severe.

Larry

blt2ski

Kirkland, Wa

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Posted: 11/05/09 06:25pm Link  |  Print  |  Notify Moderator

It is also possible, that Toyota will not give you a gcwr per say, and the max trailer is 5000 lbs no matter how you slice the cake! My ML320 is rated to 5000 lbs no matter the contents of the rig. "BUT" there are some limits, ie keeping the GVWR and GAWR's in check! This does not matter with the ML's be you have the 3.2L motor like I have, or the 5.5L turbo balanced and blueprinted 450hp motor! ALL are rated at 5000 lbs.

I personally prefer to take the loaded rig, subtract from the GVWR or max GVWR however it is rated, lets say it is 1000 lbs. I then divide that number by the hitch wt % I need, lets say 10% 1000/.10 = 10000 lbs of max trailer. If this number is larger than the rated capacity, you use the lower of the two numbers, If the rating is higher than 10K lbs, then you limit is still 10K lbs! If you have a 5W at 25% 1000/.25 = 4000 lbs of max trailer!

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BenK

SF BayArea

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Posted: 11/05/09 10:28pm Link  |  Print  |  Notify Moderator

LarryJM wrote:

snip....

That to me the above partial quote is Voodo math since you are taking what your actual vehicle weighs with the tool box, etc. and adding it to the MTWR which is typically calculated on a very are bones vehicle with minimum cargo on board and then comparing it to the GCWR.

Also, trying to add the GVWR of your TV to the MTWR for your vehicle again is Voodo math since that is IMHO a gross mis understanding of what the GVWR and MTWR for you vehicle are based on. The MTWR in no way uses the GVWR of the TV but something that is much, much less to give put the TV capabilities in the best light. Maybe with the TV with only that skinny 150lb driver and 10 gal of fuel and nothing else ... passengers, cargo.

This math almost sounds like the logic used in Obama Health Care ... the numbers are skewed to try and make a point w/o merit.

Your example I quoted IMHO has mixed apples and oranges and then compared that to pears.

Larry


That is my point...the numbers don't add up if you use real or actual
weights.

The OEMs use 'curb' as the basis, which is the base model, or also known
as the stripper model.

You are pitching exactly what I pitch all the time...

These ratings are out of context until you factor in your actual weights
and then work backwards from which ever maximum rating you wish to use

Guess you missed this in my post:

Benk wrote:

I'll not tow at my listed MTWR of 10,000 lbs. The real one is my actual TV weight
subtracted from 16,000 lbs. I then must watch the GVWR & rear GAWR, which
includes the trailer tongue weight.


* This post was edited 11/11/09 10:22am by BenK *


-Ben Picture of my rig
1996 GMC SLT Suburban 3/4 ton K3500/7.4L/4:1/+150Kmiles orig owner...
1980 Chevy Silverado C10/long bed/"BUILT" 5.7L/3:73/1 ton helper springs/+329Kmiles, bought it from dad...
1998 Mazda B2500 (1/2 ton) pickup, 2nd owner...
Praise Dyno Brake equiped and all have "nose bleed" braking!
Previous trucks/offroaders: 40's Jeep restored in mid 60's / 69 DuneBuggy (approx +1K lb: VW pan/200hpCorvair: eng, cam, dual carb'w velocity stacks'n 18" runners, 4spd transaxle) made myself from ground up / 1970 Toyota FJ40 / 1973 K5 Blazer (2dr Tahoe, 1 ton axles front/rear, +255K miles when sold it)...
Sold the boat (looking for another): Trophy with twin 150's...
51 cylinders in household, what's yours?...

mkirsch

Rochester, NY

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Posted: 11/06/09 06:28am Link  |  Print  |  Notify Moderator

If the receiver can handle 6200lbs, and the Highlander can hold up the weight of the 6200lb trailer without exceeding axle ratings, then YES, you can tow 6200lbs with it.

Odds are the performance will not be great, but they won't be noticeably better at 5000lbs if you're talking about a travel trailer.

Caddywhompus

Southeast WI

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Posted: 11/06/09 02:29pm Link  |  Print  |  Notify Moderator

The hard-core weight police have a real hard time accepting vehicles such as the Highlander. They are SO USED to the over-stated, unattainable way their full-size trucks are all rated, that anything which steps away from the same gotchas as they are used too is strange and weird.

Toyota rates the Highlander, the Sienna, the Rav4 and a few other vehicles differently than the norm. As mentioned above, most vehicles (esp full-size trucks) are rated using base-model trucks with only a driver. I won't get into the why of this, it's just fact.

On the other hand, a Toyota Highlander owner gets a little fudge room here, because the smaller vehicles are rated at a towing capacity allowing for a modest amount of people and gear to be included in the vehicle. It's not quite maximum payload, but it's about 1200 pounds which is PLENTY.

So the answer to your question is, according to Toyota, you can pull 5000 pounds EVEN WHILE carrying up to 1200 pounds of people/stuff in the vehicle. It's a really nice cushion, enjoy it.

And for the record, Toyota isn't alone here. While they rate their larger trucks (Tundra, Sequoia, 4Runner...etc.) consistant with industry standard using the base model + drive model, the smaller vehicles get a tow rating without the footnote. Other car companies that also do this (off the top of my head) Subaru, Volvo, Saab, M-B, Kia and Hyundai. I know my Subaru is rated to tow 2400 pounds (North America) even while the car is loaded to maximum payload. And my Freestar can pull 3500 pounds with about 1200 pounds of people and gear in the van as well and never exceed a rating.

So knowing this, you would think people would start to see that a vehicle like the Highlander is much more capable than first glance would indicate, but few on these forums actually know the facts, and are so used to vomiting out the same old rules of thumb that they don't notice something like this. The assume because their 1/2 ton SUV have all these caveats attached to it's tow rating, that every other vehicle on the road is so handicapped.

The new Highlander should be an impressive tow vehicle, the platform-sharing Sienna sure is.


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GBlack

Evansville, Indiana

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Posted: 11/06/09 03:20pm Link  |  Print  |  Notify Moderator

Caddywhompus wrote:

The hard-core weight police have a real hard time accepting vehicles such as the Highlander. They are SO USED to the over-stated, unattainable way their full-size trucks are all rated, that anything which steps away from the same gotchas as they are used too is strange and weird.

Toyota rates the Highlander, the Sienna, the Rav4 and a few other vehicles differently than the norm. As mentioned above, most vehicles (esp full-size trucks) are rated using base-model trucks with only a driver. I won't get into the why of this, it's just fact.

On the other hand, a Toyota Highlander owner gets a little fudge room here, because the smaller vehicles are rated at a towing capacity allowing for a modest amount of people and gear to be included in the vehicle. It's not quite maximum payload, but it's about 1200 pounds which is PLENTY.

So the answer to your question is, according to Toyota, you can pull 5000 pounds EVEN WHILE carrying up to 1200 pounds of people/stuff in the vehicle. It's a really nice cushion, enjoy it.

And for the record, Toyota isn't alone here. While they rate their larger trucks (Tundra, Sequoia, 4Runner...etc.) consistant with industry standard using the base model + drive model, the smaller vehicles get a tow rating without the footnote. Other car companies that also do this (off the top of my head) Subaru, Volvo, Saab, M-B, Kia and Hyundai. I know my Subaru is rated to tow 2400 pounds (North America) even while the car is loaded to maximum payload. And my Freestar can pull 3500 pounds with about 1200 pounds of people and gear in the van as well and never exceed a rating.

So knowing this, you would think people would start to see that a vehicle like the Highlander is much more capable than first glance would indicate, but few on these forums actually know the facts, and are so used to vomiting out the same old rules of thumb that they don't notice something like this. The assume because their 1/2 ton SUV have all these caveats attached to it's tow rating, that every other vehicle on the road is so handicapped.

The new Highlander should be an impressive tow vehicle, the platform-sharing Sienna sure is.


Caddywompus, That is good to hear. Do you know of any document that explains how Toyota rates the Highlander's tow capacity? I've looked all over the internet, in my owner manual & Toyota Tow Guide, and even called Toyota. Getting any good technical info from Toyota is very hard since their 1-800 operators don't know tech specs and won't talk with the engineering department.

BenK

SF BayArea

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Posted: 11/06/09 04:09pm Link  |  Print  |  Notify Moderator

GBlack wrote:

I thought I had this stuff figured out, but now I'm wondering. I read somewhere I can compute my ACTUAL towing capacity (rather than stated tow capacity) by subtracting the loaded tow vehicle weight from GCWR. My 2009 Highlander has a stated tow capacity of 5000 lbs and GCWR of 10800 lbs. It weighs 4600 lbs loaded. So does that mean my ACTUAL towing capacity is 10800 - 4600 = 6200 lbs, which is 1200 lbs more than the stated tow capacity? I realize I also need to meet the tongue weight limit and GAWR & GVWR limits of the tow vehicle and trailer. But assuming I do, is my real tow capacity 6200 lbs? Don't get me wrong, I don't even plan to tow a full 5000 lbs, but am just wondering how much REAL "reserve" tow capacity I'll have.


Yes, I'll take that, as I am a member of the weight police,
but do NOT tell anyone NOT to, nor it's okay. Just give them the metrics
to make up their own minds.

Even advise that this is a risk management...aka...gambling on their
setups performance.

A healthy dose of driver KNOW HOW and luck (that gambling component)
is involved.

Since most seem to only want to deal with the OP specifically. Here
is is based on the OPs numbers and assumption that they are correct.


GCWR is 10,800
TV weight is 4,600
MTWR is 5,000

No GAWR, but enough to do some basic math using the OPs ratings numbers
A few have questioned the TV weight and have advised the OP to reweigh
it, but we have what we have now.

He has done them and asking why they don't add up and I've answered
that there are other limiting factors. Chain links for the food
chain down to the ground.

10,800 - 4,600 = 6,200 lbs left in the GCWR ratings for trailer weight

BUT, that is more than the 5,000 lb MTWR and that means there must be
something the OEM sees as the limiting factor. We can guess all we
want, but we still won't know.

Oh, another but, wait a second...he isn't at GVWR yet, so that must
be where the 'extra' margin is...or did the OEM figure it differently?
We'll never know being outsiders....maybe this OEM did use the TV
GVWR to figure the MTWR and that would come out:

10,800 GCWR - 5,000 MTWR = 5,800 as the TV GVWR. GVWR info isn't
posted by the OP

There are other things to account for. Of course the GAWR and the hitch
weight rating, but there are other things like the tranny's ability
to tow over 5,000 lbs for the duration of the warranty period. Or the
brake size (sure the trailer will have it's brakes, but it is the whole
set up that matters).

Still say the OP has his head on right and use the numbers he has
posted as his planned usage. NO ONE outside of the product team knows
how much safety margin is in the published ratings. Everything is a
guess from us outsiders and to push the limits is, again, a risk
management decision...aka...gambling.

Anyone who wants to go over as others have recommended, say to them
that they should consider who will be paying for any issues down
the road.

* This post was edited 11/06/09 04:25pm by BenK *

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