A tractor-trailer coupling mechanism for a powered tow vehicle and unpowered trailer vehicle which eliminates jack-knifing. The coupling includes at least one extension or more on the trailer vehicle which is constructed to slide into a receptor channel or recesses in the powered vehicle. A locking or latching arrangement is attached at the front of the tractor vehicle. The result is that the tractor vehicle and the trailer vehicle are fixedly connected to each other as a single chassis vehicle, making the powered tractor vehicle and the trailer vehicle operate as one unit. An alternative arrangement would provide the channel on the trailer and the extension protruding from the powered tractor vehicle.