I registered mine at 9900 lbs. Saves me about $200 in registration fees in State of CT. I take it as an acceptable risk for the few times a year that I exceed that weight.
Also being registered as under 9900 lbs allows me to get a CT "Combination" license plate. (A combination of commercial/private use.) Over 10K you need a commercial plate with all its accomapnying requirements & restrictions. Combo plates allow me to drive on the passenger-car-only Parkways here and in/around NYC, which is quite convenient. If you're registered >10K lbs, and get caught on a parkway, I am told that the fine is impressive.
Unfortunately, my property taxes here are based on book value, not weight. So, that sort of figured into my decision to buy an XLT instead of a fancier model. Friend of mine with a '15 Platinum Diesel F250 just got his tax bill - $1223 for one year!! :icon_flaming: (Mine was $930)