Check out the specs on this "Ductless mini-split" model:
http://www.aafeders.com/products/ac/...3SEERSpecs.pdf
It draws under 10A on the 12,000BTU model and it's heating and cooling.
The total weight is ~120# and the outside unit is 33" wide X 20" deep X 22" high........not sure where that would fit.....but if you had quick disconnect couplings, you could set it on the ground while in use and inside the camper while towing....You could also leave it at home, when not needed (which might be 90% of the time)..
You could even have flexible and/or quick disconnect hoses made if you wanted to install indoor unit in the ceiling somewhere Like where the front, overhead cabinets are).
If Fedders doesn't have a solution for your AC needs, it doesn't exist:
http://www.aafeders.com/products/ac/window&wallac/#10
Just go to the menu on the left and click on, "Air Conditioners"
To see the one that I referenced, click on, "Ductless mini-split"
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BestBuy has a selection of "Portable" AC units. However, they are not very efficient. One of the apt buildings that our company manages has no AC in the apts. Some tenants have tried many different styles of these and haven't found them suitable. We have even had them professionally installed and properly ducted....the "Ductless Mini split" units are FAR superior but they cost more.
http://www.bestbuy.com/site/Air-Cond...d=abcat0907004