In milder areas, and especially if winterizing/dewinterizing multiple times, I would use a compressor and blow out the lines.... Drain fresh water, gray and black tanks and water heater - water heater in bypass. Insure the pump gets drained.
Not necessary to get 'every drop'.... Any water left will have plenty of room to expand.
Antifreeze in drains / traps is still needed... Certainly for those longer stitches.
I used that method after late winter/early spring trips in Michigan.
__________________
Greg
Not yet retired...
Florida (Michigan transplant)
2014 Hurricane 32A
2000 Infinity (previous)
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