I have two thoughts to add to this discussion.??
Re: converting the cab AC to R-134a:? Unless you convert ALL the components of the AC system, it will never keep as cold and the original R-12 refrigerant where you are in the humid south.? The "kits" basically only convert the filler valves, and are not as complete as what you will need for a full R-134a conversion (like a R-134 compressor).? $2000 is not all that too high to "do it right."? Shop around and you might find it for maybe a bit less.?
An Onan built-in generator is the most convenient way to go.? The (now-discontinued) model called "Camp Power" is what we installed in our Winnebago in place of the Kohler.? It is a bit narrower than the Onan "Microlite" model.? If you can find a certified refurbished used one (perhaps $1000, plus install), that would be my recommendation over a bumper-mounted portable generator that you have to keep re-filling with gas.? Too much extension and weight on the rear is not a good idea, especially if it is bouncing up and down on just one hitch point.
