When you go to register your trailer at the DVS office, you will need to bring your certificate of origin and your bill of sale. In Minnesota, your bill of sale shows that you have paid sales tax. You will not need to pay sales tax again to register your trailer in Minnesota. You will need to complete the form, Application to Title/Reg. a Vehicle form at the DVS office. Each state has different registration requirements. Be sure to refer to your state’s guidelines and regulations.