Full or empty ? Whether in a garage/house or an outside shed.
I tend to think that more gas = less air for condensation / moisture accumulation.... A piece of plastic under the cap to minimize this ?
Last year I filled the SS tank a bit too high and, at one point, raised the heat in the generally unheated room and the gas expanded and ran out the top...
We get horrible conditions where it's cold and damp and then the temp rises and condensation forms on every cold surface. It breaks my heart. Maybe a dry tank with the top sealed to keep most air out is best ?