We have a 106 gallon fresh water tank. That's about a half ton of extra weight in the very back if full when traveling, so I keep it between 1/4 - 1/2 when driving.
We go through about one tank per day, so usually each night I top it off before bed, disconnect all the hoses and put everything in the water bay, where I also have an electric heater and a remote thermometer. Here in Denver a week ago with the record low temps the heater was a life-saver. One a side note, they say to leave the grey/black water traps closed when it's freezing outside (my MH manual atleast), but that proved to be the wrong move for us. The day after we arrived in Denver it dipped below 0F and both exit valves were frozen solid. It took 2 days with the electric heater in the bay and eventually spraying warm water all over the pipes that it came loose. Now, I leave the dump traps open and make sure the hose is on a solid decline to the pipe. No issues this way, yet.
Now, to figure out how to get the salt washed off my MH :/
Oh, and cheesecake sounds good, but I think we're making soft pretzels tonight :)