Maryland Transportation Section 13-924
§ 13-924.
  (a)   In this section, "farm truck tractor" means a farm vehicle that is a Class F (tractor) vehicle.
  (b)   On application, the Administration shall issue a Class F "farm truck tractor" registration to any applicant who certifies:
    (1)   That the applicant is a farmer; and
    (2)   That the vehicle for which the application is made is a farm truck tractor, specifying its proposed use.
  (c)   For each farm truck tractor the annual registration fee is based on the maximum gross weight of the vehicle in combination with a trailer or semitrailer, as follows:
Maximum Gross Weight     Fee (per 1,000 Pounds
Limit (in Pounds)     or Fraction Thereof)
40,000 (minimum) -    
80,000 (maximum)     $5.25
  (d)   A vehicle registered under this section may not be used for hire except to haul farm products for another farmer.
  (e)   A vehicle registered under this section may not be used in any manner other than as a farm truck tractor.