What wind velocity is required to topple an empty tractor trailer, as shown here?The trailer is 48 ft long, 8 ft wide, 12 ft tall, and the trailer floor is

4 ft above the road surface, giving the trailer a square cross section. It weighs 13,500 lb.Assume the air p = 0.0023 slug/ft and kinematic viscosity v= 1.5 ×104 ft²/s.