Went a totally different direction and ended up with a very good solution. I purchased a 12,000 BTU Pioneer "DC inverter type" split system AC/heat pump and mounted the outdoor unit on the tongue and the indoor unit in the end cap.
I had to re-orient the tongue jack, remove one LP tank, and build a mounting platform for the remaining tank and AC compressor.
I used brackets to mount the indoor unit to the wall/ceiling and had to cut the refrigerant lines to length and run them through the shell. Vacuumed out the lines and tightened up the connections to eliminate leaks, then released the refrigerant.
After a ten day trip I am very pleased with the unit performance. It is extremely quiet and draws 8 amps max. Remote control thermostat can be placed by the bed at night and adjusted as needed.