This is the my first experience with owning an RV. I checked my winterized 5er this morning while preparing to leave Friday for Florida and found that the antifreeze in the toliet is frozen to a thick sludge form and glazed over on the top. Is this natural or should I be concerned. I tried to start my furnace but the propane tanks are also too cold and will not supply the furnace. I have kept the electric hooked to the RV from the house to keep the battery charged but I don't think that has an effect on keepting the water lines warm.