Yes, good advice. I keep mine in climate controlled storage. Very lucky I am. My new rig has fantastic vent fans. I figured out the one drawback to them tho. You can't drive down the road with them on, the cover flaps away and it won't even open under a good headwind. I bought one of those max air super covers to put on. That way we can vent out while under way. I'm going to put the first one on the main vent above the kitchen. If it works well then I might buy one for the bathroom fantastic too. Good to be able to run that vent while underway if somebody leaves a dukkie in there. Looking at used rigs you do see a lot that are left closed up for storage and they do smell. Those max air covers are a great thing.
'03 Freightliner FL112, 295" wheel base, with '03 United Specialties 26' living quarters, single screw, Cat C12 430 h/p 1650 torque, Eaton 10speed , 3.42 rear axle ratio