Simple winter storage suggestions for truck and camper

[Fernweh]

Just purchased a used FWC Ranger this fall and I need to prep the truck and camper for a couple of months. December-January until we use it in February for a trip.

Suggestion for
Appliance hibernation: stove, water tank, furnace, battery
Exterior suggestions, window,roof, pop top
Truck: gas tank, battery, tires, snow on roof

Thanks in advance

Jim