When I had a Motor Vehicle Dealers License in Arizona they told me 'frowned' on people adding their own ID #'s and or plates to a trailer - Howards idea is the best approach as some entities may view the creative addition of numbering as potential fraud(!). If the MVDept. Inspector Person assigns your vehicle a number you are in a comfortable position when it comes time for you to transfer the trailer. Just ask the local agency what they would require for a trailer with 'no ID marks present' - they have a procedure - it is just getting the right people to help you. They still "flip out" when I go in to register my boat - as it has an 'identical twin', according to HIN's, in Texas. Good Luck. Santa brought me the 'Sunfish Bible' for my other boat ! gotta love St Nicholas! GO. M-17 # 316a Phoenix,AZ clear azure blue skies - light breeze - and short sleeve t-shirt kinda day! **************************************See AOL's top rated recipes (http://food.aol.com/top-rated-recipes?NCID=aoltop00030000000004)