I'd be more concerned with condensation than the cold itself. For example, you have a flat screen in your camper at 0 degrees F. then bring it into a warm house. Condensation will occur on the circuit boards, etc. and could be a problem if you energize it under those conditions.
2006 23B Hybrid with 10k round bar WDH
2011 F150 4x4 SCREW Ecoboost, Max Tow, Integrated TBC, 3.73 LS axle, Firestone Ride Rite airbags.