Sounds like you need stiffer springs to me. Or if you like the ride solo sans gear, you need an adjustable spring rate via adjustable coil overs or some load assist bags to adjust when you are loaded down. That is, of course, assuming all your current components are in good repair. I run AirLift bags, but I also have a stock ride height. I can run 2000Lbs of firewood and gear in the back with the bags at 30psi. While I do see some sag, on my 120mi ride to my land up north I don't touch the bump stops once. But you also have to keep in mind this is not what load assist bags are for - they are to control sag, sway, and bounce - they make no claims of increasing capacity. My application is TOTALLY wrong - my stock suspension is still only rated for the OEM 1000Lbs....