I have a 2001 GMC one ton dually 4x4 with no lift kit just OEM suspension. I bought a 1968 Avion TC and when I went to pick it up the jacks would not go high enough. Had to let air out of the tires to get it in the truck bed. I'm going to ditch the OEM jacks and replace with something just haven't figured out what.
Hey we have almost the same set up , how about some pictures and more info on the Avion .