The older TMs (like mine) came with a 7,000BTU window AC unit. They weren't very effective. When I installed mine, I put in a 10,000BTU unit and it works pretty well but I've never had it in anything over about 95* and low humidity. In my opinion, a 5,000BTU AC unit would be next to useless unless it were blowing directly on you.
As far as cooling the camper....forget it. The AC unit would have to be very well installed, directly through a wall or window and well sealed. The camper would have to be practically air-tight (which isn't going to happen) for it to be felt at all.
If you took out the window in one of the bed areas and figured out a way to put the AC unit through that opening and seal it up. Then put a heavy privacy curtain on the inside of the trailer that would secure on both sides with Velcro, you might have a nice cool bedroom.
Remember air conditioning is not about introducing cold air. It is about removing hot air. In order for that to happen, it must operate in a sealed environment so that the air can be recirculated without further hot air being introduced.
BTW........for what it's worth, a Honda EU2000i (2,000W) generator is less than 50# and is
VERY quiet
http://www.hondapowerequipment.com/p...elid=EU2000IAN . It you watch craigslist, you can pick-up a
good used one for about ~$750.
http://orangecounty.craigslist.org/tls/1719991596.html I see them for $650 every once in awhile. Whenever I do, I snap it up because I always have friends or family that want one at that price.