Product Details: The JOST 37USL Series Top Plate ensures you are Ready for the Road Ahead™, being part of the flagship line of cast ductile iron fifth wheels that features an original locking system. Without routine maintenance, your truck could disconnect from attachment while driving, causing significant damage to your cargo and others on the road. In addition, excessive movement between the truck and trailer can affect the driving. In the end, this heavy duty Jost top plate saves you money and downtime, providing efficiency and safety in mind. FleetPride is your First Click in Heavy Duty®.