Maybe you've been there: white knuckles gripping the steering wheel while your truck camper sways back and forth down the highway. Add in some cross-winds, and keeping your vehicle centered on the road just became the kind of drive that makes you second-guess your trip altogether. Hauling top-heavy loads like truck campers or salt spreaders requires more stability than other towing or hauling solutions. This is when you need our Timbren SES severe service kits. So what's the difference between our severe service kits and classic Timbren SES kits? Both products feature the progressive spring rate of our Aeon rubbers springs. As load increases, our rubber springs push back harder, eliminating squat, sway, and roll. But our Timbren SES severe service kits use a single-convoluted Aeon spring. Designed exclusively for truck campers, these springs resist weight more aggressively to keep your vehicle level and your ride smooth. The result? No more white-knuckling it down the highway you get a safe, stable handling of your top-heavy load. After installation, there should be a 1/2" to 1 1/2" gap between the rubber spring and vehicle's frame meaning you'll enjoy a comfortable unloaded ride.FRTT350J Fits 2017-2026 Ford F-250 & F-350 Super Duty Trucks, Rear Severe Service Kit

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