Sounds to me like you are squarely in Power Wagon territory with your needs & wants. Many people start out with a 4 door Jeep, but end up with a Power Wagon when they realize it just won't do what they need their vehicle to do. 6-8 mpg, haha lol, you may be the first person to get worse mpg than my G-56 P-Wagon !!! I get 8-10. Towing our camper or empty, i get the same. Think of a PW as a 4 door Jeep Rubicon on steroids. They tow, they haul, they 4-wheel & still can take 6 out to dinner. But you can't get one with the G-56 manual anymore---SHAME ON RAM FOR THAT !!! A 6-SPEED AUTO WITH THE EXACT SAME GEAR RATIOS AS A G-56 WOULD BE FLIPPIN AWESOME !!! ARE YOU LISTENING RAM/FIAT/DAIMLER CHRYSLER ???
Sometimes you just gotta face facts, lots of people out grow their vehicles, jobs, houses, etc. .
Even the new auto equipped P-Wagons won't even know a tent camper is back there. Seriously, it will laugh at it, plus you can fill the bed with stuff & put bikes on top of bed.