As mentioned in previous posts, condensation does occur in certain areas of the TM (more so when it is humid inside the TM and the outside temperature drops overnight). We carry some micro fiber cloths to wipe up any condensation that forms. I might add that the walls stay dry . . . it is the corners where the ceiling meets the walls that collect the moisture. Some moisture tends to collect (on the bottom of the wall) along the edge of the bed. Windows can get pretty fogged up due to shower use. If you open the fantastic fan vent and run it on low speed that will take care of the moisture on the windows and some of the walls.
We have used a small compact dehumidifier (no compressor . . . uses Thermo-Electric Peltier Module) like this one:
http://www.walmart.com/catalog/produ...uct_id=4532762
The dehumidifier made a big difference while staying at Bourne Scenic Park this past weekend. It ran all night and by morning the humidity was much less inside the TM. During our stay at Hunting Island, SC the last two weeks in March the same unit kept the inside of the TM nice and dry.