I parked in southern MI for the first few winters with this RV, only two pieces of electronics have failed, (Well technically 3) and not one of those was due to cold.
One got wet
The other two old age (one was way older than the RV by ate least a decade)
Without power there is very little that can not survive 30-40 below your choice of C or F.
Home was where I park it. but alas the.
2005 Damon Intruder 377 Alas declared a total loss
after a semi "nicked" it. Still have the radios
Kenwood TS-2000, ICOM ID-5100, ID-51A+2, ID-880 REF030C most times