^i like how you think. Makes the first trip extra fun in the spring!
To the OP, I'm in the same climate as you, but used this method in AK as well with no issues.
Yes you need to winterize but it's not terribly difficult.
Drain tanks and water heater. Blow out water lines through city water connection out thru faucets and shower head/toilet. Run fresh water pump dry. RV antifreeze in each drain and a gallon in each waste tank for good measure.
Extra insurance to run antifreez thru the water lines and fw tank but this has worked for my 2 campers and I've dry blocked my boat for years as well. I'd say at a minimum blow out the lines as suggested.
Average lows aren't that cold in Portland but we always get those few cold days and that's all it takes. People screw up boats and campers in much warmer climates than here by not winterizing.
