But chocks only restrain movement in a horizontal direction and I haven't seen many camping without some type of them. With chocks (decent ones between the wheels) in place, most of the movement that is felt is vertical so assuming one has jacks at 4 corners, the next best thing is additional jacks at the wheels. Without these additional jacks, the longer your trailer is, the more you will feel bounce. After that, it's a case of restraining movement of the jacks by adding bracing like the BAL stabilizers to reduce side to side and fore/aft movement.