To find out if you need to register a car dolly in your state, you should contact your local Department of Motor Vehicles (DMV).
Here are some of the factors that may affect whether or not you need to register a car dolly:
* The weight of the car dolly.
* The size of the car dolly.
* Whether the car dolly has brakes.
* Whether the car dolly has lights.
If you are in doubt about whether or not you need to register a car dolly, it is best to contact your local DMV. They will be able to give you definitive information about the laws in your state.