Winterizing

[Gulay]

I just spent my last camping trip in Montana with my Rockwood 8289ws. Does anybody know how to winterize a fifth wheel? Should I get a winterize kit with a hand pump (I have no compressor)? I've already drained the black, grey, and galley tanks. I also removed the battery. I have no idea where the bypass valve for the water heater is located. Do I need remove the water filter?(If I can find it) I never used the fresh water tank, is there anything I need to do for that tank? Advice would be appreciated, I'm such a newbie. Thanks