Been doing it most years since late 1990's leaving freezer box Alberta for Nevada and Arizona for easter breaks of about 3 weeks. Earlier easter is more concerned we are about coming back dewinterized but never ever had a problem. Whilst heading south we leave it winterized (we do it ourselves for less than $15 every year versus being charged $150+ for dealership to do it wrong!). The Antifreeze in the grey and black keep things good there, and we carry water on board in containers for quick strip washes and bathroom use enroute. When we hit around St George Utah area by second night usually, we typically fill up the tanks and flush the lines out.
If we were in depth of winter returning, we for sure would rewinterize before hitting cold temps. It's easy the more you do it with practice and only takes us about 10 to 15 mins to pump all around including washer and outside shower as well as inside faucets, shower and toilet.
FWIW: We kick ourselves when as newbies we paid an arm and a leg to a dealership to do it and every year we started up we had leaks. Not once since doing it ourselves have we had any split pipes or over tightened plastic nuts. You don't know what you don't know eh?
