Andy,
Since your 1995 Patriot does not have an AquaHot system, you do not have to worry about that, however did you drain your propane water heater?
The easiest way to drain your washer is to blow air through the lines while it is filling as mentioned above. You can remove the lines at the back of the machine, through the removable panel above the machine, and blow the line from that direction, but that will not flush the water valves in the machine. Always add the pink stuff to the drum and pump some of it out to protect the pump.
The safest way to winterize one of these coaches is to go south to avoid freezing weather, but the next best thing is to pump the pink stuff through all the lines, Blowing the lines out with air is a distant third place.
Gerald