What Ryan said. Your reps have to know of the problem before they can reign in the BMV! Do you have the bonded title option in your state?
Sush, you might give them ideas!
In all seriousness though, like some other states have, I suppose they could. I just renewed my registration though with no problems. In and out in less than 10 minutes without a second thought given to it.
I would like to see them justify doing so, however, considering how you can literally build a car from tubing and sheet metal in your garage and that's a-okay but a HMMWV somehow isn't. I've driven by countless cops with not a second look, except the occasional thumbs up. My brother is a county deputy and said that so long as the basic safety equipment requirements (posted in the other thread) are met, there is no reason to prohibit it let alone stop it.
Like I said, it's going to take a legislative reckoning for the BMV to reign them in so, get involved and contact your reps!