update. Followed the folks' advice on here, took some finagling with valves but barely took half a gallon to winterize. Made sure antifreeze leaks out of all faucets and the outdoor shower, toilet, and then poured remaining half gallon to drains. It appears that have bypassed water heater successfully because it is empty. This was verified by opening up the valve and removing a large plastic nut on the panel @exterior of the trailer. I think I am done for the winter and want to thank you all on here for advise.
Took some frustration to get there and hope it was not too dumb of a move to pour three gallons of stuff into potable water tank.
Kids were messing around while trying to figure this out so broke off the **** antenna handle. Somehow my antenna got stuck. Going to search on info on fixing this.