It would help to know the year and model of RV that you are taking. ALso if the tanks are under the RV, or in a basement compartment.
I have a Fleetwood Bounder, and the salesman said I could camp in 10F weather, as long as the furnace stays on and keeps the inside around 70, then the basement will stay above 40, and nothing will freeze.
I have camped in 19F weather, no problems, and I used everything. I never winterized my RV until I moved to Oregon, and it actually spent time in the winter not in use. While in a campground at 20F outside, I was running a electric heater near my water pump (keeping the basement under my bed warm to about 55F) and 2 more electric heaters inside. The electric rate around here it is less expensive than running the propane furnace.
Have fun on your trip!
Fred.
