circuitguy
+1y
The rear air kit you need is the Belltech #5007, here is the link:
The air compressor kit with tank and guage you will need is the AirLift #25690, here is the link:
This is what I have on my current 97 Chevy Dually, I also used this system before on three other like trucks. I can tow anything and never it has let me down. I am sure there are other kits available for it but this is what has worked for me for many years.