Except as otherwise provided in this title, no person shall purchase, trade, exchange, or barter for a motor vehicle, trailer, or semitrailer in the Commonwealth, knowing or having reason to believe that its seller has not secured a certificate of title, or knowing or having reason to believe that its seller does not legally have in his possession a certificate of title to the vehicle issued to its owner. Except as otherwise provided in this title, for the purposes of this article, off-road motorcycles and all-terrain vehicles shall be deemed motor vehicles.