What do I need to add to my truck to tow my RV?

wkrp wrote:
The air bags take some of the weight that is in the truck bed and what is on the hitch before it starts to flatten out the leaf springs.

If you haven't seen them, they are attached from the truck frame to the axle. Not to the leaf springs.

you are right about not increasing limits however they do have some applications that will push down on the leaf springs. also have inserts for coil springs and airshock options. my bags push on my leafsprings.