In the movie Lethal Weapon 4 in the begging of the movie when Rig's partner does the chicken dance while Rigs shoots the guy in the suit who in turns "flies" into a tanker truck, watch as the trailer explodes you'll see the wheels fold under. I am sorry as a son of a truck driver and a demolition tech. I know the wheels of the trailer would not fold under the trailer but most likely would either fall off or stay where they are