... of the trailer shall be rounded.Tow barHave provision of a lock device to lock tow bar in upright position and released ... can be securely locked at 90 degrees by foot pedalRear tow-hookSecure self-locking rear hitchSurface treatmentAnti-rust primer beascoat and ... wheel, the vehicle can turn with easily and flexibly.Rear tow-hook: Operated conveniently, with self-locking device, there is no ...