Those of you that own late model Hi-Lo trailers probably know that the manufacturer included some pretty nifty provisions in the plumbing system that allow for quick and easy winterizing. I winterized mine yesterday and it took all of 15 minutes, including raising and lowering. Writing this probably took longer than actually doing it:
1- Lower the tongue jack as far as it will go
2- Open the fresh water tank drain
3- Open the water heater drain (unscrew the drain plug or open the drain valve) and flip open the relief valve
4- Locate the fresh water pump and water heater compartment inside the RV
5- Close the heater bypass valves
6- Open the water system drains in the floor for a bit and close them
7- Put the pump antifreeze pickup tube in a container of RV antifreeze and open the pickup tube valve
8- Turn on the water pump so the antifreeze can be pumped into the system
9- Open all kitchen and bathroom taps, hot and cold.
10- Monitor the RV antifreeze; you may need more than one gallon
11 - Close all taps after you get undiluted antifreeze coming through
12- Open and close the water system drains and the heater bypass valves for a second, just long enough to get some RV antifreeze in these lines.
13- Close the pump antifreeze pickup tube valve
14- Close the heater and fresh water tank valves once all the water is drained
15- Raise the tongue jack if desired
16- Done
Easy Potable Water System Winterizing - Late Model Hi-Lo
Linear Mode
