I drain the water tank, drain the gray water tank, drain the black water tank, drain the water heater, run some antifreeze down the drains, remove the shower hose, blow out the lines, remove the lines on the pump and run some antifreeze through the pump.
I don't add water again until summer. I had a motorhome in the 90's. I made a mid April trip to Arkansas and returned home the end of April. I didn't winterize when I got home and April 30th we had a winter blizzard and got 10" of snow. It froze up both tanks and broke the pump.
I could have stayed a month of first class hotel suites and left the RV home for the cost of the repairs alone.