I hope this gets seen and this is the right place for this. If you're camping in winter, what do you do about freezing pipes. We bought a class C for my wife's mobile dog grooming business, but have a real problem trying to figure out how to fill and use the water on those really cold days. If I fill the tank on a cold morning it freezes going in. Most times I can fill it at night right when she gets home, and then we just wait for everything to thaw the next morning, if it's warm enough. We were thinking about getting a portable water tank that we could bring inside and fill, then take out and somehow hook in. Do any experienced RV-ers have any suggestions on using the RV in winter as far as the fresh water goes?