Primarily the truk will be carrying a 2300 lb x 12 ft. overhead camper. The truck had only 3 leaves in it and was lowered all 'round. I got "new" coil springs from the same truck, at the salvage yard, when I got the rear leaf springs. Gonna change them soon but I'm kinda tired out right now. Sore too.
I have been looking at Air Lift 5000 bags and the Firestone bags as well. I'd like to keep the truck as smooth and comfortable as possible and I think bags will do that when not loaded; just deflate them and all should be okay.
What of my original question - could I just add some spring pads on the frame? This would keep the springs as from the factory for the truck they came from. ( it was a 2000 one ton with single axle in rear. Mine is a 1991 "dually" with 2wd and 4 speed overdrive automatic )