(a) "Agricultural tractor" means every self-propelling vehicle designed or used for drawing other vehicles or wheeled machinery but having no provision for carrying loads independently of such other vehicles, and used principally for agricultural purposes.
(R.C. § 4511.01(J))
(b) "Multi-wheel agricultural tractor" means a type of agricultural tractor that has two or more wheels or tires on each side of one axle at the rear of the tractor, is designed or used for drawing other vehicles or wheeled machinery, has no provision for carrying loads independently of the drawn vehicles or machinery, and is used principally for agricultural purposes.
(R.C. § 4511.01(GGG))