I do this every year, leave PA and head to SC, then come back. I de-winterize at the first campground we get to, making sure we have full hookups and provided temperatures are above freezing. This permits a hookup to sewer and water, which allows for ample flushing of the lines.
For the trip back, I winterize down south, unless temps up north will be above freezing when I return. (I have a nice garage to blow out the lines and add antifreeze, and like doing it at home if I can) HOWEVER, I dump all tanks down south, flush the black tank good and drain the water tank and water lines, and don't use water/bathroom on way home.
On my unit, the water heater stays in bypass mode when de-winterizing, when everything's flushed out good, I open up the water heater bypass valve and let it fill. When prepping to return, I bypass the water heater first, drain it, and put a new plug in.
I always have the manual handy when doing the process, it helps considerably.
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