Take two boats to the harbor, bring a cordless drill, launch said two boats into harbor bring one boat back with you and don't forget to bring the drill back as well. Just kidding! It's illegal - don't even try it! 
Use to work with a guy back in the 70s that had a little side business of stealing and re-selling boats. This was shortly after we made the move from Tahiti to Hawaiian. He was a rigger, and as a matter of fact still is in business in OC. (people love him...if they only knew) Anyway, he'd rip off a boat and trailer, order a brand new trailer and then take the boat down to the Golden launch ramp by the Queen Mary. His friend would be there with the new trailer in tow. They'd launch the boat with the old trailer tied to the hull, idle out to the deep water and cut the trailer loose, come back to the ramp and and set the boat on the new, legal trailer. Changing the numbers on the boat is a piece of cake, the trailer is a little harder. He made a killing doing this.
Never, ever put much stock in the paper work you recieve with a used boat when you buy in so cal. This kind of thing was done by many, and often. I can't imagine how many trailers are rusting away down in that channel.
