I ix it all air bags super springs, timbres, you na it I tried it . Then I talked to a real expert, and who is a real expert when it comes to suspension on vehicles. Truck Campr sales lots have the easy to install things that make them money ( mostly) A Suspension shop are experts fro small to large trucks. I was told a story about superstrings that were put on ambulances. turned out not to be the very best solution, same with the other little goodies. A shop that specializes in everything from ambulances, truck campers semi trucks one shop in my arenas been in business for 55 years they do work for the local cities ,counties the state, and private enterprise. my truck was a 2007 dually long bed, over the years the springs were out of factory specs. they put the springs back to factory specifications, then he added a extra spring in the middle. All this was done with the camper on the truck it does not sag bounce porpoise any of those weird things you here about on forums. If you want expert work see a expert