Condensation consternation

[Mach1tosh]

I work at Home Depot. Living in the Pacific Northwest, temperate rain forest we get a lot of precipitation, fog and the like so it's most always damp.
Had a couple yesterday looking for solutions to the dreadful condensation they are experiencing. They are living in a 31' airstream trailer, want to add insulation to the vents to keep cold from coming in and reduce the moisture.

The trailer is equipped with a radiant heat system. A boiler that feeds fluid through pipes under the floor. Works great in houses, but for a trailer...well.

They are hooked up to shore power so I suggested they get an electric heater and a dehumidifier to help dry the air.

The blinds on the upper windows (non opening) seem to trap a lot of condensation behind them. So I advised them to keep the aforementioned blinds open and vent the trailer using the fans to draw out moisture. As to the vent insulation I suggested that they try putting a 2" foam insulation on some kind of pad that they can attach over the opening using a stick on Velcro tape to allow the vents (fans) to be used.

I also recommended they use DriZair to remove the moisture. We use it in our trailer over the winter in concert with an electric heater set to about 40F just to keep things dry and prevent freezing of the interior plumbing, which has been drained and blown out but any lingering moisture won't be an issue. Change out the 4 DriZair pots about every 3-4 weeks and it keeps the trailer (21FB) nice and dry and mold free through the late fall, winter and early spring 'til we start using it again.

Here's hoping that they have a better, more comfortable winter in their trailer. Thanks in large part to what useful information I have gleaned from frequenting this site, they will have some relief from the moisture problem.