Hi,
Too late now, but packing the lock with Vaseline works in the far north. I use a radiant heater to melt the compartment doors on my unit.
Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp-hours of Telcom jars, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.