The trailer is operated from the truck's tipping valve (simple solution, requires the least amount of assembly). There is a new hydraulic distributor block (1) at the truck's waist joint, which can be used to route the hydraulic hose (2) to the back of the truck to the quick coupler (3). Tipping: 1) When tipping, the truck must be parked so that the truck is at a 90-degree angle to the trailer. 2) When tipping is started, the truck always tips first (the hydraulic oil flows more easily inside the truck), then the trailer. 3) When tipping back, the truck also goes back to its lower end position, followed by the trailer. Note: It is possible to retrofit a 1-channel diverter valve into the trailer chassis (as in the case of normal tandem trucks), but in this case 1 channel must also be routed from the truck's receiver to the rear.