I've got the heavy duty superlift springs on my Dodge 1/2 ton short box, man are they stiff! I've got a 7.5 Western Pro Plow that weighs 600 lbs and when I lift it the truck only drops 1/2 inch. I've loaded the back full of split oak even with the cab and only dropped the bumper down 2 inches. Talk about lumber wagon! I just bought a unused set of super lift springs for my Wrangler for 100 bucks, but now I don't know if I want that ruff of a ride.