Okla. Stat. tit. 47, § 47-1-125

Implement of Husbandry. Every device, whether it is self-

propelled, designed and adapted so as to be used exclusively for

agricultural, horticultural or livestock-raising operations or for

lifting or carrying an implement of husbandry and, in either case,

not subject to registration if operated upon the highways.

1. Farm wagon type tank trailers of not over one thousand two

hundred (1,200) gallons capacity, used during the liquid fertilizer

season as field storage "nurse tanks" supplying the fertilizer to a

field applicator and moved on highways only for bringing the

fertilizer from a local source of supply to farms or field or from

one farm or field to another, shall be considered implements of

husbandry for purposes of this title.

2. Trailers or semitrailers owned by a person engaged in the

business of farming and used exclusively for the purpose of

transporting farm products to market or for the purpose of

transporting to the farm material or things to be used thereon shall

also be considered implements of husbandry for purposes of this

title. Provided, no truck or semitrailer with an axle weight of

twenty thousand (20,000) pounds or more, which is used to haul

manure and operated on the public roads or highways of this state

shall be considered an implement of husbandry for the purposes of

this title.

3. Utility-type, all-terrain vehicles with a maximum curb

weight of one thousand five hundred (1,500) pounds which are

equipped with metal front or rear carrying racks when used for

agricultural, horticultural or livestock-raising operations shall be

considered implements of husbandry for purposes of this title.