curprev04:4004:40, 19 September 2022 49.255.158.158talk 17,397 bytes−275 deleted [Often, the only difference between the models is where the exhaust exits, with diesel engined heavy rated vehicles having a vertical exhaust ''stack'' above the cabin and the light rated vehicles having the exhaust exit under the side or rear like a car.] This is inaccurate. Underbody exhausts are commonly used in all classes of rigid chassis heavy vehicle.undo