Hi Bill, I had to go back over your old posts to see what kind of rv you have...it would be nice if you put this info in your signature so that everyone will know what you're talking about.
I agree with others... you need to pay close attention to the towing limit of the rv and the "actual" weight of the towed vehicle. By the way, a "tow" vehicle is the one doing the towing (such as your rv).
Some Class C's are only capable of 3500 lbs towing limit but most are 5000 lbs.
Sounds like you're wanting 4WD plus a little comfort. Can an AWD vehicle be a substitute for 4WD? Provide us with a little more info and we can better provide you with recommendations.
To answer your other question...you'll need a base plate (what the tow bar connects to) installed on the toad, light wiring (brake, tail, signal) installed, and a toad auxiliary braking system with breakaway capability.
Hope this helps
Ron
Ron & Sandie
2013 Tiffin Phaeton 42LH Cummins ISL 400hp
Toad: 2011 GMC Terrain SLT2
Tow Bar: Sterling AT
Toad Brakes: Unified by U.S. Gear
TPMS: Pressure Pro
Member of: GS, FMCA, Allegro
RETIRED!! How sweet it is....