Too much dryness can be a bad thing. It seems that some gaskets in =
difficult-to-reach positions inside the wings can become brittle in =
bone-dry environments. When using an electrical dehumidifier, it may be =
a good idea to set it at least at 50% RH. The goal is to store the =
glider in its trailer at more or less the same relative humidity it =
experiences when outdoors, minus some margin to allow for the quick =
increase in RH as temperature drops throughout the night.

A positive side of trailer vents is that whatever the temperature =
fluctuations, it will not become dripping wet inside even if the trailer =
is left unattended for a long time. Vents also help to moderate internal =
temperatures in hot weather.

My trailer has both a solar vent (with adjustable inlets) and a small =
dehumidifier, but if I lived in a very humid climate I would probably =
seal it in the winter and check every week or so.