If it's like the Montana then it has the bypass valve VanMan described and also has a clear hose off the water pump. At one end of that hose is a valve. Turn that valve so input to the pump comes from the clear hose. Put the hose in a bottle of antifreeze, turn on the pump, open the faucet farthest from the pump. When the pink flows, turn that one off and do the other (cold or hot). Then work your way towards the pump. I'm not sure it's necessary to start with the farthest but that's how I was taught.
Don't forget to pour a little antifreeze down each trap including the shower drain. And pour a little in the toilet bowl so the seal doesn't dry out.
If you have the outside shower, don't forget to treat it like any other faucet.
Last, on your city water inlet connection, remove the screen and push the little white pin to release water under pressure in that valve. You shouldn't have to watch for pink there, just get rid of that water under pressure before it freezes and ruins that valve.
It's also a good idea to drain the lines at the low point valves under the trailer before starting the winterizing, just to get as much water out of the system as you can. Maybe that's not really necessary but it always made me more comfortable.
If you have a washer/dryer, check the manual for the procedure.
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