Winter tips

25 ft tt located North Tenn.
Trying to figure out if leaving a couple light bulbs
100 watt on and or a small fan in salon an bedroom
Will it do much to fight condensation?

Crack in the ceiling vent?
Also getting the tires off the ground.
Frig door ajar.
Plumbing issues are ok
Cabinet doors ajar?
Empty of any food/items effected by days of below freezing
temps.