I certify that, to the best of my knowledge, the title is. 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.Create a Utah bill of sale form to document the transfer of ownership of a vehicle or another piece of personal property. Motor Vehicle Bill of Sale (Form TC-843)– Can be used to prove the sale and purchase of either a motorcycle or automobile in the state of Utah. The state provides Form TC843 for use as a bill of sale on vehicles sold in Utah. 1. Obtain the Utah State Motor Vehicle Bill of Sale form. How to sell your used car or truck privately in Utah. Read the the steps and forms you need for selling a used car on your own in Utah.