I ran across an interesting A/C solution. It is designed for use in over the road highway trucks, for use when not going over the road. That is, for use when parked. It's from Idel B the same folks who bring us the Truckfridge. Try as I did to find the cost I was unsucessful. I found distributors / dealers in the US and Canda but none listed prices. I believe that is indicative that it is not a bargain basement item, not something to directly challenge the Fridgidaire window units often seen in TD and TTT.
Basic info over here.
5 models, 2 capacities; 3240 BTU and 6140 BTU.