General rule is less than 2' rear overhang no flag over 2-5 feet needs a red/orange flag that should free flap, over 5 feet put the flag on and hope your get a cop that failed measuring, don't get argumentative on the side of the road take it and pay or cry to local judge. If any of you are trailer length over 53' you deserve a ticket because you should know the rules. I would never go into a scale in any state, if there is no u.s.d.o.t number on the side of the power unit, again if you don't understand that jiberish DON'T GO INTO THE SCALE. This pretty much works for all 47,states 48,if you include Washington d.c.. California is a whole different world if you are there you are on your own, there is a reason I have not been there in fifteen years fly in drive the car out is really the only option there.