It would have to be very special circumstances for me to have any of the portable A/Cs in my TC. With the right TC, I would consider a window mount in the rear of the TC.
I would even consider a window mount in the backseat of my truck, if my truck and TC had sliding windows. This is a good cantidate for the back seat;
Dog House Air Conditioner. It has remote, and will run off of a 1000 watt generator. Cost about $530.
I am cheap, and bought my 1988 TC in 2004 for $1000. I installed a new A/C for about $600. I bought this
Polar Cub 9,200 BTU - Coleman-Mach Air Conditioner. It now sells for about $700. I have no special storage/set/drain drama to deal with, and I can run it with my Honda 2000.