We "camp" in my buddies 5th wheel toy hauler. Sleeping quarters in the front 1/3, garage in the back 2/3rds. We don't have running water in there, so I make a point to do an over night saddlebag ride by the 3rd night. 2 nights is my monkey butt limit. For water and food, he has one of those big Yeti coolers that sits in the living quarters. We turn off the heat when we go for an over night trip, and even on the coldest nights (-20 or colder) the water jugs don't freeze in there. Back in the 70's my Dad drove us all over with the Winnebago, and he mounted a water tank inside so we had running water when we needed it, but that was quite the modification to the existing plumbing.
If you plan to use it for towing sleds and staying in it, I would avoid water just to save that head ache. Me personally, I like the hotel/motel rooms. Staying in my buddies trailer is fun, for a couple nights.