well, now that I'm feeling a little better, and got my sick/vacation time sorted out, I figured I'd get back to upgrading the GMC.....soooo, I just got off the phone with Air-Lift and ordered rear air bag suspension for the long rides with the 5th wheel.
I ended up with the Air-Lift Wireless Air-Remote Air Compressor 72000...
it automatically maintains set pressures,
controls two springs independently,
two-way communication allows advanced diagnostics for safety and peace of mind,
no lines or wires to the cab,
wireless handheld unit that can be used in or outside the truck
and the Air Lifter Ultimate 88275 Air Bag Kit.....all for just over $800
I have a lot of friends that run air-bag suspension, and love it...so hopefully I'll be as happy as they are.