Welcome from Connecticut!
Mice can be a perpetual problem. To draw them out, you will need traps baited with peanut butter, or mouse bait that will draw them to a water source, When they drink they die so be sure not to have water available near the camper. If you go with snap traps, I would suggest that you anchor them. They aren't always an instant kill. The one time I didn't anchor, the little critter managed to wedge himself where I couldn't reach easily What a mess!
After you're "mouse free" there are precautions to take. I use crumpled tin foil to fill any access hole bigger than the tip of my pinky (plumbing, electrical drainage etc...). I also use CLING dryer sheets, but change them out when the scent is gone, as they make excellent mouse bedding, once the smell is gone! I've heard various reports about ultrasonic noise makers. I use three of them in my camper, and haven't seen any mouse signs in over three years when used in combo with the other resources. I prefer not to use poison once I'm "Buttoned up", as I really don't want a critter dead inside my rig.
As far as electrical issues, mice might be an issue. Before spending any money, I would check fuses and bulbs.
As far as yearly upkeep, try searching winterizing etc... There are several good posts on the subject.
Good Luck,
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Pull Toy
Steve & Jan, Ava & Emma (Mini Schnauzers):
2016 F350 Lariat 4X4 Powerstroke CC/SB "PULLTOY V"
2013 Alpine 3535RE "MAGIC CARPET IV"
Proud Navy Vet!
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