Utah Code Ann. § 41-1a-214 – Registration card to be exhibited.

(1) For the convenience of a peace officer or any officer or employee of the division, the owner or operator of a vehicle is encouraged to carry the registration card in the vehicle for which the registration card was issued and display the registration card upon request.
(2) For a vehicle owned by a rental company, as defined in Section 31A-22-311, a person driving or in control of the vehicle may display the vehicle's rental agreement, as defined in Section 31A-22-311, in place of a registration card.