Glad to hear you were wise enough to get a two-hose unit (separate intake and exhaust hoses through the window). It should work well for you.
As for keeping it in place while you travel. I assume that when you close the TM, you would like to leave it in the same spot as when the TM is open. Since it is 3 feet tall, it should fit under the lowered ceiling OK. How about designing a cap for the unit, to fill the gap between the top of the AC and the lowered ceiling? Then the lowered ceiling would hold it down. For visualization purposes, think of a block of stiff foam. The block is bigger than the top of the AC unit, and has a well cut out of the underside, an inch deep or so, and sized the drop over the top of the AC unit. Once in place, the block is thick enough that, as the trailer is folded, the ceiling just contacts the top of the block, holding it down.
A simple block of foam might not be the ultimate best approach, but you get the idea. Whatever you use needs some resilience, but not too much.
Of course you would want to attach some kind of hooks or brackets to the wall, to keep the AC from moving sideways as you travel. I can think of a couple nifty ways to do this - but perhaps that it the subject of another posting.
Bill
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