For phawk33. Loved what Protagonist had to add (because of what I did.) Mounted a 142# dual fueled 3500 watt on the tongue and eliminated full 20# bottle use, although I keep a 20 pounder forward in my Escalade EXT (a fancy pickup) for emergency use and to refill my 1 pound bottles. So I do not know how you'll handle your 20 pounders which you are unfortunately tied to. In the Jeep or elsewhere you will be required to store bottles in a sealed or vented vessel as 20 pounders can "gas' i.e. "vent". On my wheeled generator I added 2 removeable 19" dropdown extensions on the side opposite the roll around handles. These drop downs have the wheels attached. To remove the generator I bolt on these extensions and flip up the handles an remove the generator from the tongue. I only move the generator inside the AS when away ( to prevent theft). But this is easy for me as I no longer have a step. I use a slant ramp sometimes and am in the process of an airbag suspension retrofit to for a full kneel down. This to make an easy step up height when ramp is not in place. Since my 1958
Caravanner frame was not to be trusted I added 2" "L" angle steel front to back on each on each rail. Therefore I eliminated any frame flex at front or rear. I put my spare on the rear bumper modified to resemble the 1950s continental kits on cars. I don't how you solve your possible frame issues. My weight and balance was easy for two reasons. First, on a single axle like mine = simple calculations but yours not so. Second I gutted the Caravanner to 2180 pounds and replanned the interior to an exact 300 pound tongue weight. Easy for me as the EXT holds wood (for wood stove heat), kerosene, gasoline, 1 gallon water bottles, 18 each point source 1 pound propane bottles, the slant tamp, Foldable "Little Red Wagon" et.al. I do not have a propane frig, propane hot water heater ( I use a pressurized turkey fryer with foot air pump for shower), or installed stove/ oven. You'll have to leave propane on tongue , use the generator and spare tire for balance . I do not envy your problems.