Does your unit have tank heaters? If so, you should have absolutely no problems. We fill our tank and use our on-board fresh water system. Just close your waste tanks (so water doesn't freeze in the drain hose on the way to the sewer connection). Let your furnace run once in awhile to keep the basement, docking station and sub-floor plumbing above freezing.
Also, when we fill our FW tank, I just disconnect the hose from the CG spigot, drain the water out and let it lay out on the ground (with a plug in the end to keep stuff out). That way it's ready to use to re-fill the tank if needed and.........did you ever try to roll up and store a cold hose?
This way, you only have to do it once when you leave.
Anyway.....to each their own but, that's how I do it and its worked so far.