It all depends, if its winterized and going from a winter location to a warmer place for a vacation, keep it winterized until you hit warmer weather. If your camping and changing locations in below freezing, you should be ok until you arrive. Going from warmer to colder, you could simply blow the lines and open the lower gravity drain. We often travel early spring and late fall where weather can drop below freezing. On travel days the TT stays as is. When we stop for lunch, I fire up the furnace which also heats the underbelly.