Carl-
As a new member, I get to advise you of the duties and privileges of the "Search" tab on right side of blue bar above.. That is one of many benefits of joining here...
If you type in "generator" and Air conditioner and honda or yamaha or some other brands, you'll be linked to dozens of existing threads or messages from people expressing their feelings and knowledge of generators...
I'll try to give you condensed summary...
1. Only Honda or Yamaha type inverter models are quiet enough for most parks
2. You'll need at least 3000 watts of power, maybe more. That means either a pair of Honda Eu2000's in parallel, or a big Eu3000 or more.
3. The big ones are too heavy to easily load into tow vehicle and back, unless you can run in pickup bed or have clever ramps and wheels...
4. It is possible to convert generator from gasoline to propane, and hard mount on the trailer tongue, but it requires talent and skill and effort.
5. The contractor models like Coleman you'd buy at Home Depot or Lowes are cheaper, but really noisy and vibrate.
6. The yellow "Chinese copy" (literally) of Honda generators are cheaper, and may be reliable, but not a lot of data yet.
7. Using old bad gas in a generator will cause problems.
8. Running A/C on fewer watts than required can and will damage compressor even though it might seem to work for a short time. Long term cost is substantial...
That about sums it up...
John McG