Okla. Stat. tit. 47, § 47-14-110: Carrying registration certificate - Inspection

The registration certificate for any truck, trailer, semitrailer

or combination thereof shall be carried in or on the vehicle at all

times and shall be presented on demand of any officer of the

Department of Public Safety, Oklahoma Corporation Commission, or any

sheriff for inspection, and it shall be accepted in any court as

prima facie evidence of weight registration or legally authorized

load limit of the vehicle.