This form may be used in lieu of a bill of sale if the department is questioning the purchase price. Request the buyer's name and address in case there are title or registration problems after the sale.• Prepare a bill of sale for the buyer. How do I fill this out? It serves as proof of a legal change of ownership and reflects details of the sale like the vehicle's age and condition at the time of purchase. Illinois Recreational Vehicle (RV) Bill of Sale Form. Use our RV bill of sale to document the details of an RV sale and help transfer ownership. The buyer agrees to accept the item with any known or potentially unknown defects in the property. The Electronic Registration and Title (ERT) System allows you to complete and print an Application for Vehicle Transaction(s) (VSD 190) online. Why is the vehicle purchase subject to use tax?