You have to be very careful just draining or blowing out with air that you get everything out or you will get ice in a low spot. We got ours winter camping. Disconneted the city supply and used the(heated) fresh tank for bathroom breaks overnight. Hooked the city supply up in the morning ( above freezing) and pushed the plug that had formed in the inlet to the kitchen sink.
BTW-our waste tanks are heated too, factory option.
2004 Dodge Ram 2500 Club Cab 4x4 CTD
2007 Sunline Solaris T-276-SR: Misty Blue/Cherry
2001 Dodge Ram 1500 Reg Cab 4x4 OFF-ROAD