You need a motor dealer licence if your business involves buying, selling or exchanging motor vehicles as a retailer or a wholesaler. Motor vehicles include cars, motorcycles, caravans, and some trailers.
A trailer is a vehicle built to be towed, or is towed, by a motor vehicle and does not include a trailer that weighs 250 kilograms or less when empty. A towable recreation vehicle with living space or sleeping facilities is also classified as a trailer.