Is an hour of your time and the cost of a few gallons of R V antifreeze worth more than the time and cost involved if for some reason the heat was off for an extended period? How often does the person in charge actually check the facility? If they went on a vacation during the winter holidays will someone else be looking in on the facility?
I bought a T T years ago which had frozen up throughput the winter. I knew this before I bought it and I got a good price on it. Part way through the project I began to regret my decision to buy the trailer in the first place. I did get it done, sold it and made a profit I was happy with but I swore off ever buying a previously frozen up camper of any kind again.
Water lines, water heater, P-traps, faucets, valves etc. Replacing the drain in the shower was a real bear. Not cheap either. Ugh!
2002 Fleetwood Storm 30H on Workhorse P32 chassis 8.1 gas.