Compared to the integral steel plate spring rigid bridge, the towing arm adopts a flexible articulated guiding structure, combined with spiral springs and hydraulic damping shock absorbers, which can effectively isolate high-frequency impact vibrations on the road surface. The vibration suppression effect on the spring is much better than that of the rigid plate spring bridge; At the same time, the towing arm forms a triangular truss structure with sufficient bending and torsional stiffness, making it less prone to deformation of the bridge shell, collapse of the rear axle, and offset of the wheelbase under heavy load conditions. It is also suitable for dual scenarios of passenger commuting and short to medium distance freight transportation. The left and right wheels are hinged to the frame respectively by the towing arm. When one side of the wheel encounters potholes or bumps and produces vertical jumping, the amplitude of vibration transmitted to the other side of the wheel is greatly reduced, which is different from the disadvantage of complete linkage jumping of the left and right wheels of the overall bridge; Although it cannot reach the level of fully independent suspension decoupling, the manufacturing cost is lower, the structure is simpler, and it is suitable for developing countries with many damaged pavement, gravel roads, and rural dirt roads.