I was the ser. mgr. for a motorhome dealer for 15 years. We always had from fifty to one hundred motorhomes in stock at any time. Every year i had to winterize all the motorhome on the lot. I never had one freeze up. I have also owned five motorhomes since 1974. None of these ever froze up. I have always blown out the lines with air. If you blow out your system correctly, you will not have a problem.
1998 Pace Arrow 35 ft. F53 Ford V10 2012 Honda Civic toad
15 year motorhome service manager. 3 popups....2 travel trailers....5 motorhomes....loved them all.