How about a big maybe?
The drain system is no sweat,just clean out the sinks and shower and call it good.
The supply side is another story though. If there is antifreeze in the supply plumbing, it will take a bunch of water to flush it out, and you may need to drain the tanks after.
Even if they just blew out the lines, I usually use de-winterizing time as my excuse to sanitize the system, running a little bleach through, then rinsing it like a crazy man, then changing all the filters.
How bout this?
Make sure the propane is full and the furnaces work. Put maybe 20 gallons or so in the fresh water tank, then disconnect and drain the hose so it doesn't freeze.
Open the drain on the water heater, the low point drains, and all the faucets. Make sure all the other valves are in the normal position, and turn off the water heater bypass. If you have an ice maker, flip the bail up so it stays off, and open the fridge vent cover on the outside, and check and make sure the ice maker hoses are hooked up. I always disconnect mine so it is dry in the winter.
Turn on the pump and start closing valves as the water runs clear. Low point drains will be first, then hopefully the water heater, then faucets.
Keep a hot faucet open until all the air is gone, then close it and light off the water heater.
Put a cup of clorox in the fresh water tank, fill it halfway, and open each faucet in turn (hots first) until you smell bleach.
Leave it like this until you get to a warmer climate. You can flush, and wash. Bring drinking water and try to ignore the bleach smell.
At your first full hookup campsite, do a full flush of the entire system, repeat until it doesn't smell like bleach.
Then turn on the ice maker and run the clothes washer through a couple cycles (if you have one. The washer will suck your water tank dry before you know it, and fill your gray tank even faster, only use it with full hookups.)
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