If you're talking strictly about the plumbing, I'd hook up a hose to the fresh water inlet, purge all the lines, THEN after they are clear of antifreeze, open the low point drains, purge them, THEN, close the low point drains, Fill the fresh water tank, add chlorine to sanitize it. Open the hot water heater bypass, fill the hot water heater (it will have bleach in the water). DO NOT turn on the HWH yet, run the faucets until you smell bleach at every hot and cold tap (don't forget the outside shower and toilet). Let it sit for 24 hours, drain and flush the fresh water tank, drain and refill the HWH, refill the fresh water tank and water heater with "clear, non-bleach water", This will effectively flush some of (but not all) the lines again.
Then, reconnect to the city water tap, flush the lines, once you do not smell bleach in the cold or hot water taps, turn on the HWH and check it for operation.
Then, find some place to dump your gray and black tanks......
Keep in mind this completely removes any protection from freezing in your entire plumbing system, so don't do it if there's a chance for additional freezing weather (unless you intend to re-winterize your system).
You will still need to check tire pressure, propane system, wheel bearings, roof structure and seals, and the host of other actions that are not plumbing related.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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