Air Lift’s LoadLifter 5000 Ultimate air-spring kit may be the answer for late-model four-wheel-drive Ford Super Duty owners looking for more stability when towing heavy loads. Equipped with Air Lift’s heaviest-rated air springs, the Ultimate has all the benefits of the LoadLifter 5000 plus a urethane jounce bumper for added shock absorption. The kit includes two-ply reinforced bellows, air lines, fittings, brackets, mounting hardware and instructions, and the no-drill installation takes less than two hours, according to Air Lift. The LoadLifter 5000 Ultimate comes with a 60-day money-back satisfaction guarantee and a lifetime warranty, and is compatible with 2011 to 2017 F-250 and F-350 4WDs with single or dual rear wheels. Kits are also available for a variety of other vehicles.