A FYI note. Frequently, the city water connects into the RV's internal plumbing somewhere after the water pump. When you pump antifreeze from the siphon hose it won't go very far up the city water line because of a check valve at the city water connection fitting. That length of hose will likely still be sitting with plain water in it. Need to use a little hand pump or the like to force antifreeze into the city water connection. How much, depends on your plumbing system design.
Fred & Denise
Santa Fe, NM
2007 Excel Classic 30RSO 2007 RAM 3500, Diesel, 6Spd Auto, SWD, 4x4, CC & LB