six holes for holding weight fixation rods are disposed on the steel plate in the actual test by adjusting the number of weights on each weight fixation rod the vehicle front wheel load and rear wheel load and the vehicle center of gravity position are accurately controlled and adjusted the traction hook adapting mechanism 104 is disposed at the bottom of the trolley body the weight and fixation device 102 consists of weights fixation rods and locking nuts wherein each weight is a cylinder of 400 mm diameter and 50 mm thickness with a through hole of 60 mm diameter at the middle the fixation rod is a m 48 threaded rod of 500 mm length and the bottom end of the fixation rod is threadedly fixed onto the bottom of the trolley body the locking nut is a self made m 48 external hexagonal nut the rear wheel and axle assembly 103 consists of rear wheels and an axle assembly and is tightened onto the trolley body via bolts the wheels and tires may be optional because the test is for the purpose of front wheel evaluation in which the rear wheels just assist in driving and the axles are self made the wheel and suspension system assembly consists of the tested wheel tire 201 the hub bearing 202.