When i go to the DMV Office to surrender my plates, what the first thing that i need to do?
You will need to first remove the plates and stickers.
I heard that liability insurance are not required by some trailers. So do i need to surrender the plates if the trailer is not insured?
Yes however, if the trailer does not have a valid registration, you need to surrender the plates regardless of whether the trailer required or not to have a liability insurance.