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Back to the OP - a heat gun at the fitting MAY loosen things enough that you can remove the hose without damage. Once that hose is off you can then start working on the drain line on the camper, starting at the outlet and working back to the tank. Be real careful with a heat gun as some put out way lots of Btu's. A hair dryer will not put out enough heat or volume @ speed if it's really cold. When done. inspect for drain line damage clear back to and including the tanks and valves, especially if they ended up full. Fresh water can expand as much as 9% when it turns to ice and breaks things.
Now, winter camping - nahh, I'm not a masochist especially after a stint in the US Army years back. We had a battalion commander that loved to have his troops 'experience' the real conditions of -20 winter exercises (he stayed in his nice warm quarters, venturing out only occasionally)
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