Turn water off outside, disconnect from trailer, drain all tank's (black/grey/hot water) open all tap's . Use compressor to blow air through water line's where you disconnected water supply to trailer. Make sure toilet is open to get all water out. When no water is coming out from tap's or hot water heater pour RV anti-freeze down each sink and bathtub to fill trap's. It doesn't take much to fill trap's. (about 16oz. will do. Ithen put about a gallon in my black and grey tank's and leave a bit in toilet to keep seal lubed.
That is pretty good advise. However if you have a washer/dryer you will also need to pump anti-freeze through the water lines and into the washer to prevent it's water pump from freezing. Also, if you use the air compressor method be sure to limit the air pressure to around 20PSI. Also take the drain plug out of the hot water heater.
also do not fill fresh water tank to install antifreeze ! if you decide to go that route . i blow lines out and still install antifreeze.
use the suction side of the water pump .
dont forget to remove water filter if you have one.... most new units have one.
dont forget outside shower if you have one as well
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