Perry SmallMay 23, 2018 at 8:04 am 5 out of 5 Installed This kit on my F250 Super Duty before my last trip towing a 35ft 5Th wheel trailer. Nice level smooth ride. The spring compressed about halfway and still had a great ride. I feel a lot safer towing with this kit. Very happy! I did not want to have air bags and all the hard ware and air. With SumoSpring I never have to think about it again. No air needed, no worries about air bag failure and no worry about having air available.