If your vehicle is an antique, you'll certainly want it shipped in an enclosed vehicle to avoid road damage to the finish. Look for a hauler that has experience with antique vehicles -- some companies specialize in this work -- and ask questions about tracking your car during transit.
If your vehicle is not in running condition, the hauler will have to make special arrangements to get it in and out of the truck.
Ask your hauler what equipment will be used and how your vehicle will be stored aboard the truck. A hydraulic liftgate may be a safer way to get it aboard than driving it up a ramp.