I just winterized ours yesterday, took about 15 minutes and 2 gallons of -50 RV antifreeze. After draining all water out of the lines and hot water tank, I bypass the water tank, then drain the water filter cannister, remove filter if there (mine is gone) and replace it with an empty plastic water bottle. Put the cannister back on the mount, remove the input to the water pump, screw on bypass hose and put other end into RV antifreeze jug. Turn on the water pump, and then open all sink faucets, shower faucets, and run the toilet until it is the colour of the antifreeze. Once complete, turn off pump, remove pressure in lines, undo filter cannister and drain out antifreeze (should be only 1/3 full due to empty water bottle taking up space). Replace all lines onto pump ready for next year.
I put moth balls around our tires, and have sealed up any and all holes underneath with foam insulation, and put 2 traps inside on the floor, hopefully the little critters will stay out. Whatever you do, don't use poison or you'll be smelling dead mouse for months.
from Alberta Canada
2011 Flagstaff 8526RLWS 5th Wheel
2011 Ford F250 4X4 Crewcab Superduty 6.7L Diesel
B&W 3300 Hitch for Ford 5th Wheel Prep package