In 2008/09, I bought a boat here off SCJB. The seller was in AZ, and the boat and trailer was titled in CA. The last two numbers on the boat title were backwards, (57) and the boat was a ('75). However, there was NO HIN on the boat to check the title number to. AZ Fish and Game issued a new AZ HIN number along with the AZ numbers.
The trailer was a mess too, title plate number and actual trailer plate number was 1 digit off, and No VIN number on the tounge, either. I fixed that part, and lost the (wrong) plate, and everything went through AZMVD without issue.
Another boat trailer had the same VIN number as a boat trailer in Tucson, But it was an '84, mine was a '73, only a 5 digit VIN #.
Dan'l