NOAA rescue beacon, handheld and mobile HAM + Forest Service and other gov channels radios. (Anyone can transmit on any channel in an emergency.) Winter down mummy bags, xcountry skis except in summer. Gear for hiking out in very bad weather. (We have unpredicted storms.) Chains.
Norway and Sweden in March? Lows will be below freezing. I would look on ebay for a warm water resistant goose down jacket with a hood. Marmot or Northface would be good but most any backpacking brand will do. You might get by with the Amazon
Essential Light Weight Down Jacket, $60, but...
Update and caution. Tried placing cotton balls soaked in peppermint oil as suggested. Was sick so couldn't check for two months, result: no mice and the truck still smelled like peppermint, but then I got to thinking is peppermint smell a good idea where there are bears? So didn't renew the...
A serious shovel for every person in the party.
A hiking GPS with up-to-date topo maps. (We have a maze of logging roads.)
Regular cell phone plus a no-contract for another provider that partly covers the area.
Chains for 4 wheels.
Except in the summer and again for every person...
Update. Previously after trying mothballs and steel wool we stills had lots of mice in the spring traps. Now after spraying Raid on the wires in the engine compartment and putting spearmint soaked cotton balls around we had no mice after sitting for one month. Maybe just luck.