I have a 2008 travel trailer. I am very confused on summer/winter storage of the unit when not in use. I have had 4 different directions provided. Should you lock it tight and cover with a cover and place a dehumidifier in the unit? Should you lock it tight, not cover it and leave ac at 90? Should you open vents and not cover? Should you not cover and leave locked tight? We want to protect our investment but were told that if we cover our unit in the summer when it is humid, mold will grow under the cover on the roof. Any guidance/suggestions welcomed.