Hi I currently own a 1995 k3500 double cab srw with 8' box. It has the 5.7L and 4l80E with corp. 14 bolt with 4:10 ratio. When I put about 5-600lbs in the bed and hooked up our camper with 750-800lbs of tongue weight my truck squatted pretty good. About as mush as my 1/2 ton Suburban did pulling the same camper. Thing is the rear leafs look really good as in all friction pads are there, no rust and the rear rake without load is perfect as far as I am concerned. 1. Do I need replace the rear leafs that are 25 years old? 2. Would I be better off to add airlift/ firestone helper bags to maintain good ride and load capability? 3. Towing the 7800gvw camper it struggled getting up some hills. My 5.3l Suburban pulled easier but felt the chassis and brakes were not adequate for this trailer. What can I do to the 5.7l with 185k milesto get some more get up and go?