A lot of the trailer builders rate a 10,400# trailer as 9990# gvwr to help folks workaround that. Then you need to have a tow vehicle that's rated to pull 10k#, which relates to the engine option as much as the chassis rating. As far as ticketing is concerned, I'd hate to have to deal with an over zealous cop... or find myself getting screwed (could be very bad) during an accident investigation.This is the law in PA at least. I have never heard of someone getting ticketed for this on a occasional/pleasure use this is mainly for a for hire or commercial type operations.
Federal law states that any trailer with 10,000# capacity even if empty requires a class A CDL, if you stay in your state your laws will be different and you will be okay till you cross the state line.