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 > 2007 Tundra Tow Vehicle with 34 foot trailer: the numbers.

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travelnutz

West Michigan - On the Lakeshore

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Posted: 05/28/09 03:55pm Link  |  Print  |  Notify Moderator

NEVER, and I mean NEVER exceed your tow vehicle's actual stand alone axle rating and especially not when towing an item that's heavier than the tow vehicle it's self. You'd be asking for an uncontrollable failure and the results and ramifacations that occurs from it. Fools are born every day!


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Keith99RS

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Posted: 05/28/09 03:58pm Link  |  Print  |  Notify Moderator

cwit wrote:

No matter how wrong you are you are going to try and prove you are right. It won't change what is on the door and never will.You are being baited with true information and so you can show you just like to argue or.


Oh? You mean like how you said the air bags added to a pick up are the same as what is on a dumptruck? See my link. Does that look like the suspension on a pickup to you?


Dubdub actually summed up what I have been saying about spring rate and air bags. The bag is preventing the spring from compressing, not acting as suspension. The spring rate of the leaf pack is unchanged.


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Keith99RS

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Posted: 05/28/09 03:59pm Link  |  Print  |  Notify Moderator

travelnutz wrote:

NEVER, and I mean NEVER exceed your tow vehicle's actual stand alone axle rating and especially not when towing an item that's heavier than the tow vehicle it's self. You'd be asking for an uncontrollable failure and the results and ramifacations that occurs from it. Fools are born every day!


And they are all flocking here to defend themselves....

macbwt

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Posted: 05/28/09 03:59pm Link  |  Print  |  Notify Moderator

You folks would have had a bad day when that ole boy pulled in this last weekend towing a 5th wheel with a chevy 1500 pickup truck.


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Keith99RS

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Posted: 05/28/09 04:01pm Link  |  Print  |  Notify Moderator

Yers ta Discover wrote:

Keith99RS wrote:

Yers ta Discover wrote:

Keith99RS wrote:

Yers ta Discover wrote:

Leafs often crack in the winter, probably had it overloaded, hit a big bump, and that was the end of the story.


One problem with your theory Yers/AM, We did our hauling over the summer early fall. Spring failed in the summer. Cold was not a factor.


So what was the cause.


Probably the very thing you keep defending. Overstressed by overloading. Probably overstressed due to overloading and cracked at the axle mount. Took it awhile to separate and come free from the leaf pack.


I see, well, its never happened to me. Maybe your father didn't know his truck's limits.

Next time tell him to wedge a 4x4 between the axle and the frame, it will save him from having to replace his springs.


Never said he did, but who was I as a 14 yearold to question him. According to you all he needed to do was put a 4X4 in place of his springs and he'd have had a 3/4 ton. I am not suprised you would say that.

HamsHog

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Posted: 05/28/09 04:03pm Link  |  Print  |  Notify Moderator

American Made wrote:

Maybe we can try to keep it civil, not resort to flaming, or pointless criticism and arguing. If you have facts, let me know, but please recognize that I'm trying to research and then describe what I'm actually towing; this is not meant to be bragging about what this truck can do, and is not intended to be a troll for either the weight police or the "my domestic is better than your import" or whatever.

The last thread got shut down, I presume because the arguing got pointless, and taking the risk that this may happen again, I'll post the weights as I committed to when the other thread was open. I stopped by the scales today on the way back from replacing all 4 tires on my trailer (another story for another day) and here are my weights:

I will admit that I overstated my initial weight guesses -- while saying it's probably better to overestimate than underestimate. So as things are, if you don't want to follow the math, I will be hauling more like 10,000 lbs if you include what's in the truck and in the trailer, and not the 12,000 lbs I initially claimed.

First:
Unloaded Truck
(with me in it): 6270 lbs
(The 5th wheel hitch & rails were there, but not generator or other passengers)

Complete rig: truck, trailer, etc: 15,708 lbs

Truck Fr. axle: 3,498
Truck R. axle: 4,532
Truck, both: 8,030
Trailer axle: 7,722

by math:
Just Trailer: 9,482

Other interesting calculations: Pin wt: 1,760, which is very close to 20%.

So before I add passengers or generator, or food, clothing, and bedding to the trailer (my usual camping gear, BBQ, chairs, etc. are already loaded) I'm still under RCGVW, under on trailer weight, and about 400 lbs over the rear axle rating. I'm also 900 lbs over on RGVW for the Tundra. After I add the above, I believe it is reasonable to expect I'll be over the rear axle rating by 600-700 lbs, over RGVW for the tow vehicle by 1,200 lbs, and still be just under the maximum rated towing capacity. RCGVW will likely be exceeded as well.

SO. . . Am I over? yes. so please don't bother stating the obvious.

Is this illegal? Well, I work in various capacities with the Ontario Provincial Police, and I know the Ministry of Transport official who was at the weigh station this afternoon when I weighed the truck and trailer. According to both sources, NO LAWS ARE BEING BROKEN. The vehicle manufacturer gives ratings based upon engineering principles, and accounts for the "weakest link" In the case of this truck, that was the tires, followed by the springs which were adjusted for a car like ride up to ~ 1,500 lbs payload. The design of the rear axle, in engineering terms, doubles the tire and spring capacities. The remainder of the drive train, as well as the brakes, are likewise over-engineered. There are maximum amounts a non-commercial vehicle can tow, and I'm nowhere near that.

Does this mean that you can safely double your rated capacities? Of course not! But it does mean that you can to up to and even above the rated capacities, and still be safe. It is possible to be over the manufacturer's ratings, and still be safe. It would be unwise to exceed these ratings dramatically, as eventually things will break, but ratings are established recognizing that people will by nature push the limits.

As was pointed out in the other thread, before it got shut down, towing ratings generally follow the power and weight of the tow vehicle. Driving this rig, the way it is set up, is in my opinion, the OPP and MTO and mechanical engineering opinions, safe.

This may be too much for the "black and white" thinkers to swallow, but it's the facts. What are yours?


Hey AM,

I tow a good size trailer with a 1/2 ton too. Not a 5er, but I need room in the bed for stuff!!!

Back in the late 70's I carried a 300 gal. water tank in the back of a Datsun pickup. Bought some Chevy rims with 8 ply tires to run on the truck. 2400#'s of water, every day, 40 mile trip with 20 miles uphill, for a year. Sat on the bump stops, and never a problem with the axle or anything else. Just had to take my time...

Good camping and hauling to you!!

Regards, Hamshog


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Keith99RS

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Posted: 05/28/09 04:04pm Link  |  Print  |  Notify Moderator

macbwt wrote:

You folks would have had a bad day when that ole boy pulled in this last weekend towing a 5th wheel with a chevy 1500 pickup truck.


Never said it could not be done. There a quite a few 1/2 ton towable fifthwheels and are quite acceptable when matched to the right and properly equipped 1/2 ton. The OP of this thread meets none of those catagories.

NC Hauler

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Posted: 05/28/09 04:20pm Link  |  Print  |  Notify Moderator

So HamsHog, are you running around with your truck 1,000# over it's GVWR, and proud of it like AM or just condoning that "it's all good". Your set up looks pretty reasonable from what I can tell, but sounds like, that it's no big deal if someone grossly over exceeds the manufacturers recommendations for towing and carrying capacities. Safety isn't really any part of the equation in this issue we're discussing?
Talking about having a bad day if we'd seen some guy tow a 5er into the campground with a 1/2 ton. I haven't read anywhere in this entire post, or the last one identical to this one where it was ever said that a 1/2 ton couldn't tow a 5er, nor was incapable of towing a 5er. We know that there are 5ers out there now that can be towed by 1/2 tons. Now would it have, shall we say, attracted our attention if AM would have pulled into the campground with his combo, which he has so proudly boasted of being 1,000# over the trucks GVWR, I would imagine that more than just Keith and I would have been observing and discussing it throughout the campground, but cause me to have a bad day????while camping???? THAT was funny, not going to ruin MY day.


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tomhole

Loveland, OH

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Posted: 05/28/09 04:37pm Link  |  Print  |  Notify Moderator

Keith99RS wrote:

If you fill it to 50psi, it is at 50psi even under load. You do not increase air pressure by compressing.


That's just wrong. My air bags are at 5 psi with nothing in the truck. After I hook up the trailer, they are at 22 psi. I added nor released any air. Sorry, you are dead wrong on this particular aspect of your arguement.

I cannot explain why tire pressures don't change with load.

I cannot explain if air bags effect spring rates.

Tom


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NC Hauler

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Posted: 05/28/09 04:50pm Link  |  Print  |  Notify Moderator

What they DON'T do is add any more weight carrying capacity to a vehicle and they tell you that right on their product. I had the 5,000# capacity Firestone airbags some years back as I stated earlier and they, Firestone, STILL stated that installing their airbags did not mean you could still exceed your vehicles GVWR. They are great at leveling a load and, when aired up and carrying a load, helping the vehicle "cushion" the load to some extent, while leveling. As someone stated and it is true, Increase air pressue in them with the vehicle unloaded and it does yield a rough ride.

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