Water in these trailers is no big deal. The carpet can be dried out or replaced. The cushions can be air-dried or taken to a professional cleaner. The rest of the inside is an easy wipe down process since the walls are fiberglass, not ensolite. It sounds like the missing window is the main culprit, but the fan could be leaking, too. Again, not a big deal, except for finding the correct size window. There are several answers on this forum about replacing these windows
and using other model windows
, etc.). The price seems to high for this amount of work, but the work itself is not hard.
The size is officially a 13' UHaul CT, but that counts the front tongue.