I winterize my RV pretty early in the season. Also I take it to the dealer I bought it from to winterize it. $100 and they do everything for me. No chance I'll miss a detail somewhere along the line. They also check my seals, caulking etc. So it's a pretty good service.
It's a common thing to be wary of the RV antifreeze, but it is currently considered to be completely safe for human consumption. It's used as a food additive in many items and even as a buffer for some medications. I make sure my fresh water lines get good and flushed before I use them though.
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