â–¡ Not included with the vehicle sale. A Utah motor vehicle bill of sale, known as Form TC-843, is an official document that provides proof that a vehicle has been sold in the State of Utah.An RV Bill of Sale is a legal document that serves as proof of the sale and transfer of ownership of a recreational vehicle (RV) from a seller to a buyer. A Utah motor vehicle bill of sale is written documentation of a transfer of vehicle ownership. Create a Utah bill of sale form to document the transfer of ownership of a vehicle or another piece of personal property. The state provides Form TC843 for use as a bill of sale on vehicles sold in Utah.