Whether you have recently purchased a trailer or are new to the state, if you live in California, you need to register and license your trailer. It is a fairly simple process to license a trailer in California after you have completed the registration papers and paid all the fees. You can even get personalized or special interest plates for your trailer.
Register your trailer with the California Department of Motor Vehicles (DMV). You must register your trailer in California within 10 days of acquiring it. If the trailer was purchased from a dealer, the dealer will handle the registration and transfer of title for you. However, if the trailer was purchased from a private seller, you will need to contact the DMV to make an appointment for registration. According to the DMV, to register your trailer, you will need: a completed application for title/registration, proof of ownership, bill of sale, smog certification (if the trailer is an RV or motorhome), transfer fee, registration fee, tax and vehicle license fees.