Yeah, the reg definitely says motor off, and not moving.
There’s gotta be some jack legg out there with a 5.7 vortec, and a steel brush guard doing 50 down a dirt road just hoping for a deer to jump out in the road. But that’s probably legal.
It's legal, but expensive. I've done it twice. The brush guards won't save headlights and quarter panels, when a fat doe catches one corner and spins around to slap the front fender. The last one even got my passenger door and mirror.
I hate making a good first impression. There’s no way I can keep that shit up.