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which makes him responsible for filing returns under this Act, such retailer shall file a final return under this Act with the Department not more than one month after discontinuing such business. Where the same person has more than one business registered with the Department under separate registrations under this Act, such person may not file each return that is due as a single return covering all such registered businesses, but shall file separate returns for each such registered business. In addition, with respect to motor vehicles, watercraft, aircraft, and trailers that are required to be registered with an agency of this State, except as otherwise provided in this Section, every retailer selling this kind of tangible personal property shall file, with the Department, upon a form to be prescribed and supplied by the Department, a separate return for each such item of tangible personal property which the retailer sells, except that if, in the same transaction, (i) a retailer of aircraft, watercraft, motor vehicles, or trailers transfers more than one aircraft, watercraft, motor vehicle, or trailer to another aircraft, watercraft, motor vehicle retailer, or trailer retailer for the purpose of resale or (ii) a retailer of aircraft, watercraft, motor vehicles, or trailers transfers more than one aircraft, watercraft, motor vehicle, or trailer to a purchaser for use as a qualifying rolling stock as provided in Section 2-5 of this Act, then that SB3019 Enrolled LRB104 20255 HLH 33706 b Public Act 104-0468