The JOSKIN monocoque tipping trailers are fitted with very resistant synthetic rubber seals all around the body (except Trans-KTP 17-22-27-34). Their door is kept closed by a side lock. This system ensures a perfect seal, even with the smallest seeds.

The doors on the JOSKIN tipping trailers are also equipped with two safety devices. The first one is a pressure relief valve. When the door cannot be fully closed (e.g. when there is an obstacle), it engages and regulates the oil pressure to prevent damage to the system. The second one is a double check valve on each door ram to hold the door in position if a hydraulic hose breaks or if the tractor stops.