If I had room for the evaporator I would have put a mini in my Toyota years ago! Have 3 in my house, self installed.
There will be no condensate in the bay, the inside evaporator is what produces the condensate.
There have been minis put in bays so should be doable, with my limited knowledge I would not go that route. The minis move huge amounts of air to cool, I would guess a 1000 cu ft a minute, as an example a roof air pushes about 300 feet a minute into the living space. If you can leave both bay doors open and not fill the bay up with stuff would work. With the exhaust side as close to the door as possible.
Be aware the cheap mini's directions can be horrible if not wrong, have no technical back up, no parts so they are disposables. Buy from bigger online sellers and not from a van in a Wal Mart parking lot.
