Independently published
RV or marine antifreeze is used when winterizing plumbing so water left in the lines is less likely to freeze and damage them. If your RV stays in freezing-free weather, you may not need it.
RV owners who winterize or store in cold climates.
RV & Trailer Winterization & Opening Checklists: Built for Winters, Deep Freezes, Storage, and Spring Opening (ASIN B0H9B1HH34). Amazon's page has the current price, specs and reviews.
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Check current Amazon listing (ASIN B0H9B1HH34).
Fine print: The Dude has not personally tested this product. The details on this page come from the Amazon listing and can change; check the listing for the current specs, price and availability.