Welcome to the forums.
We had an A/C unit hidden in a cupboard in the Flying Cloud but I could not get it vented properly to get decent cooling. I moved to a 1957
swamp cooler I found in a local recylcer magazine (even came with the original owners manual) and it works pretty good. I realize that there are pros and cons to swamp coolers, but this thing works sweet - is vintage like my cars, my trailer (heck, even my wife - she'll kill me if she knows I said that
) and the only downside at all is the fan is a bit on the noisy side.
Even way way way up here on the coast of frigid Canada we need A/C or a cooling system enough to warrant one. The issue is finding one that looks good at the same time. I've never been a fan of the ones on the roof just because no matter what you do, they are an "add on". My wife thinks I'm nuts and my friends with their twin to ours have one that came on it (looks like something from the sixties) but having some level of cooling capacity is helpful. Fans help, but they don't always cut the mustard.
By the way, be very cautious about having someone else tow that trailer. Very recently a lady on the forum had a trailer picked up in the south east and hauled to CA and it disappeared along the way. She did get it but only after involving the State police (not sure which State) and many nights of angst (my new word for the day).
Pictures of your new trailer would be great.