Tennessee Code Title 55. Motor and Other Vehicles § 55-9-206

Any motor truck using the streets, roads, highways, and other public thoroughfares, which, by reason of its construction, either when loaded or unloaded, prevents the driver's view of the rear, shall be equipped with a mirror arranged in a manner and maintained so that the driver or operator may view the roadway to the rear and note the approach of vehicles from the rear of the motor truck.