It's my understanding from reading various posts, that the RV antifreeze will freeze, but will turn into mush instead of a solid chunk of ice. The mush does not expand as much, thus no damage to the plumbing.
Charlie & Lizzie the Mini Dachshunds
2008 Jayco Eagle Super Lite 30.5 RLS
2015 F350 Lariet Crew Cab Long Bed 6.7 Diesel B&W Companion Hitch
24 hours in a day, 24 beers in a case. Coincidence? I think not.