I've had my truck for several years and am currently setting it up for a FWC Fleet model. I drove it back (1,800 miles) from Salt Lake City with just air bags and it was fine on the interstate. It just road like I had a load in the back... and I did. Since February I have done the following to add more suspension assistance: 2 1/2" front lift; added a leaf in the back which lifted the back about 1 1/2". Added a set of E rated tires (KO2). I wanted the little extra clearance as well as the stiffer side walls for off road back country camping. I haven't loaded up the camper yet for the summer, but will soon.