Using an RV in chilly, but not fridgid weather

Last January we saw temps down to -4F in southern Virginia on our way to Florida. The '95 Coachmen Class A we had at the time handled it just fine, with only a minor freeze up of a stub pipe to our water system pressure tank. That was easily cured in about 5 minutes with a hair dryer. We could have just left it until the temp went up since it didn't affect water use other than making the pump run every time a faucet was opened. The furnace kept us toasty warm inside.