The Camco Big Bag RV Stabilization Kit is a 14-piece kit that includes everything needed to stabilize an RV or trailer. Each stabilization piece is made of durable, UV-stabilized resin and is easy to use. The kit includes (2) tri-levelers for customizable leveling, (2) wheel chocks to help keep your trailer in place, (4) regular and (2) large stabilizing jack pads that help prevent jacks from sinking into the soft ground, (2) wheel stops that lock into tandem tires to prevent movement while parked or re-hitching, (1) tongue jack stand to evenly distribute the weight of the tongue and (1) heavy-duty duffel for convenient storage.