If you have access to power, these seem to work well. I have two of them plugged in during the colder months on our 34’ toy hauler, they use about the same power as a 60w bulb, they do not get hot and are only warm to the touch.. I have one in the garage and another in the kitchen area. They’re recommended to be placed on the floor and do not collect water, so there is not a collection pail to worry about. I also keep one in a 21’ boat that is tatted, have not had a single problem with mildew.
https://www.davisinstruments.com/product/air-dryr-1000/