Open trailers are either partially or fully exposed to the elements. There are many different types of auto hauling, open car carrier trailers, ranging from small three car carriers to the large 11 car carriers that you often see on the Interstate. Enclosed trailers are protected from the elements, and your vehicle shipment is basically shipped in a mobile garage. Having your vehicle shipped enclosed is typically a 30-50% premium over having it car shipped on an open trailer. Most cars can be car shipped either on an open car carrier trailer or in an enclosed car carrier trailer. It all depends on what you want to spend. Some trailers are made to transport antique cars.