The passage below is from the Oklahoma website that was listed below. It sounds to me like 102" is the max for the main body of the trailer & things like awnings & pins can stick out a little more. On my H212, I had support rails sticking out beyond the 9.1' beam. In the case of hay bails, they let you have 11'
"A. Except as otherwise provided for by this chapter, no vehicle, with or without load, shall have a total outside width in excess of one hundred two (102) inches excluding:
1. Tire bulge;
2. Approved safety devices;
3. A retracted awning with a width of eight (8) inches or less or other appurtenance of four (4) inches or less which is attached to the side of a recreational vehicle, as defined in
Section 1102 of this title; and
4. Pins used as a safety precaution or as a load-assisting device if the pins do not extend the overall width of the vehicle beyond nine (9) feet. The State of Oklahoma hereby declares it has determined, in accordance with 23 C.F.R., Section 658.15, that such pins are necessary for the safe and efficient operation of motor vehicles.
The provisions of this subsection shall not apply to any person engaged in the hauling of round baled hay with a total outside width of eleven (11) feet or less when the hay is owned by such person and is being hauled for any purpose other than resale. The provisions of this subsection shall also not apply to any county official or employee engaged in the hauling or pulling of a trailer or equipment owned by the county on the county roads of such county."