Re: Registering Trailer
Don't know if you have the same thing where you live, but in GA you register the trailer as "home made". Take it to the County Sheriff's office to have it inspected (basically for lights and to verify that it doesn't have a previous VIN number), and they assign it a new Homemade Trailer VIN plate which you then permanently affix to the trailer (rivets or non-removable bolts). After the Sheriff's office assigns it the new VIN, you take it back to DMV to register the trailer.
I've had to do it to every trailer I've owned here in GA. Half-day process.
Rgds