We just purchased our TT, Florida here and have had lots of rain this summer. We have been running a small fan and keep the small damp rid buckets in the TT. Put 2 in around the 30 of July and replaced them this week. We like the ones with solid removable top if you can find them. Then when you go to use the trailer you can pop the top on for travel and remove it and use them while camping. This works for us, have thought about a dehumidifier but that's just one more thing to pack/unpack and we have limited storage as it is.