I had a experience with super springs that led me to a suspension and spring shop, in chattanooga, the owner makes springs for tractor trailers and suspension work on heavy duty vehicles and special duty vehicles. chattanooga had a fleet of ambulances that had suspension problems porpoising sway sounded like a truck camper problem, The suspension shop removed the super springs increased the number of springs in spring pack and modifications that helped the drivers maintain a higher degree of control at high speeds and adverse driving conditions ambulance problems solved now for a T/C on some models and years of certain vehicles the right rear spring pack was weaker because some engineer thought that with a fuel tank on one side of the vehicle and other off set factory parts it would work to have the rear passenger side a little weaker the solution he weighted each wheel and axle and devised steel strength formula so the truck and camper would be level when fully loaded. he put two extra springs on the passenger rear side and one extra spring on the drivers rear the owner did not need air bags and it was perfectly level, my truck was a little easier two extra springs on each side now no side roll good cornering and it is level