I installed a set of Firestone air bags with their "in cab control to increase or decrease air pressure and a guage beside the switch. This was on my 02 Chev 3/4 T and have thought about doing the same to my 09 Ram 1 ton but even with my heavy 18k fifth wheel it runs pretty level. The Firestone package included "everything you needed" and was fairly easyto put in other than drilling the frame above the axle to mount the brackets.