[72 cheyenne pdx]

I am not sure if it was a factory option or if the PO made it, but my FIL had air shocks on his 69 El Camino that had Schrader valves that mounted right under the tailgate. He said it was great to have because, whenever he had to carry a load in the "caruck", he would roll into a gas station and put air into the shocks to put it back to stock height. I would assume that you would be able to do the same thing with bags as long as you kept the bags independent.

Good luck on the set up.