I'm interested in finding out about the MaxxFan, too. We just got back from a 2.5 week trip to Juneau, Alaska in our 1973 Boler
and had lots of problems with condensation so now we're looking at fan options.
Fusedlight, I agree with everyone else that your "leak" is condensation. We live in a very dry place and so haven't had much of an issue...but once we got to the coastal rainforest of Juneau, where it rained pretty much everyday, we couldn't believe how wet things got just from condensation. We found that leaving the windows and roof vent wide open during the day, plus cracking them at night and running a small space heater really helped. Luckily we were in a USFS campground with electrical
I also kept a dish towel handy for wiping the walls and window bases dry regularly. That helped to stop things from getting wet just from brushing up against the walls.