Brake & Suspension up grade?

[87Bob]

I have an 85 1/2 ton. I believe that I have the thin rotors. What would it take to upgrade to the thick rotors beside just the rotors? Calipers, spindles, mounting brackets ect? Also what can I do to beef up the rear brakes and suspension? I want to build this truck to pull a 7,200 pound enclosed car trailer. I thought I'd use an Air Ride lift kit for the times I'm pulling a trailer or hauling a load. Can I up grade the shocks to the 3/4 ton shocks (will they interchange)? I am going to add sway bars to both front and rear. Thanks in advance.