I have just tried out using my portable dual hose AC unit in my TT and, using only one Honda 2000, was able to cool down my 20" unit admirably. I do mostly dry camping without access to 30 amp service. Rather than buy a 2nd Honda 2000, I tried using my portable unit. It is a snug fit between the bed and the wall of the TT, but it did fit.
Rather than using the larger and stiffer 5" hoses supplied, I used 4" dryer hose. I had to modify the connections but was lucky enough to find, at Lowes, two kits (one for each hose) designed to use as a clean out point for 4" dryer hose. I flipped the connections around which gave me a 5" to 4" hose connector that fits into the AC unit and then connected to the 4" hose. The other half connected from the 4" hose at the other end.
I then dropped the hoses down through the "laundry shoot" and into the basement of the TT. I finally took a piece of foam board insulation, cut holes to fit pvc connecor and the inside of the hatch door. Now both hoses vent to the outside and I don't have to worry about humidity in the "basement" or rain getting in with the hatch door open. I wrapped this peice in white duct tape to help water proof it and try to make it look less hillbilly ;-)
This unit isn't as noisy as the unit on the roof when it cycles on and off. Overall I'm pleased with the functionality of my "project" but I'm sure someone could come up with a design that looked better.
Carolyn