I would never be happy leaving my coach during a show event. Want to be there to deal with the unexpected. Slides in, slides out, sort of toss a coin. Conservative, pull 'em in. Me? Likely leave'em out and take my chances.
Must do! Put blocks under jacks, that way the blocks will freeze to the ground and the jacks will break free from the blocks (I use plastic for that). Even if you are not leaving soon, that is your plan! Someone may have other plans for you, be prepared to up jacks and move.