My newly acquired travel trailer is currently being used as a guest house. My sister in law is staying in it, along with her two kids. She complains that she gets motion sickness while laying in bed and the kids are up moving around. I already know that when we go out camping, my wife will probably complain of the same thing. What does everyone do to minimize movement while parked? I have all four jacks down, along with the tongue jack too and the camper is sitting level, but apparently it still moves a bit.