Rear air bags for towing a trailer

[sdailey]

I own a Chevy 1/2 ton crewcab Silverado Z71 and am looking for a rear air bag setup to use when towing my 20' car trailer. I'm installing a toolbox on the tongue of the trailer for straps and such, but the box will also house a 9500# winch, which weighs @95#'s. Then figure in the weight of a battery to operate the winch. So I'm looking for an all-in-one kit (i.e. bags, compressor & such) that will get my truck back to level ride height when I'm towing my trailer.

Any suggestions?