Once a sale is agreed upon, create a comprehensive Bill of Sale to prove ownership transfer. Downloadable forms and instructions on how to create a bill of sale document for car, auto, truck, boat, firearm, horse, or other sales in the state of MichiganReassigned title or registration, or a bill of sale from dealer or the owner for snowmobiles purchased out of state. Registrations are valid for three years. Establish a clear record of your motor vehicle transactions in Michigan. Our online vehicle bill of sale template is quick and easy to use. A Michigan trailer bill of sale provides the buyer and seller with a rundown of the deal they established between one another.