Updated: Readtime: 7 min Every product is carefully selected by our editors and experts. If you buy from a link, we may earn a commission. Learn more. For more information on how we test products, click here. Your truck sits dead level all week. Then you drop a gooseneck on the ball, or load the bed for a job, and the back end squats, the nose lifts and the steering goes light. SPELAB builds rear air suspension kits for exactly that moment. They’re air springs that bolt in between the frame and the rear axle, and they take load only when you ask them to. That last part is the whole point. Empty, you run low pressure and keep the ride you already have. Hooked up, you add air and bring the rear back towards level. SPELAB rates its kits at up to 7,500lb of load-levelling capacity across an adjustable 0 to 150 PSI range, and builds the air spring from 6mm multi-layer rubber it says it tests to 435 PSI burst pressure. The range runs to four kits. They cover Ford Super Duty, Ram 2500, and Chevrolet and GMC 1500 and 2500HD. Prices ran from US$249 to US$329 on the SPELAB site on 21 August 2026, and the brand is running code AFFILIATE for 15 per cent off the rear air suspension kits. At a Glance - 5th-wheel and gooseneck towing: Ford Super Duty Kit - Late-model Ram 2500 owners: Ram 2500 Kit - Half-tons carrying a loaded bed: Chevrolet and GMC 1500 Kit - Older three-quarter-ton work trucks: Chevrolet and GMC 2500HD Kit 1. SPELAB Rear Air Suspension Kit for 2011-2016 Ford F-250 and F-350 Super Duty The Super Duty kit is the one SPELAB points at 5th-wheel and gooseneck work, and it’s the most expensive of the