Well, both in and out. Returning from a trip, the TT gets plugged in and water hooked up. Slide then goes out and over the next few days or week, I'll dub around (Maine term) the camper cleaning, rearranging and basically thinking 'Jeez, wish I was camping'. After a while, slide comes in and it's ready to go for the next trip. That said, can't see any harm in leaving it out.
2015 Freedom Express 246 RKS
2009 GMC Sierra 1500 Z71
Days camping previous years: Not Enough
Days camping in 2016: Still Not Enough