This all depends on the size and weight of your vehicle. A standard car or truck can pretty much fit in any option you choose to ship your car. Pretty much any standard sized vehicle in the category of sedan, regular sized trucks, normal sized S.U.V.'s and even some vans again depending on the size which are determined by length and height.
The total size of a vehicle able to fit on an open auto transport carrier would depend on the other vehicles which would be loaded along with it. If you have seen an open auto trailer, you will notice that the top level can be adjusted to different heights which would allow for the loading and unloading of many different types of vehicles. In any case, expect the vehicle to be strapped down to the frame of the trailer.
Thick leather straps or light chains are used around the wheelbase and securely fastened to the metal frame of the open-air auto carrier trailer. This avoids the vehicle from bouncing around during transport and ensures that the unit will be delivered in the same condition as it was picked up.
Please Note: Low clearance vehicles may require alternate methods.