I wasn't going to chime into this thread, because I know next to nothing about the subject. HOWEVER, THIS I want to chime in on. There's a reason that this regulation exists. It's because vehicle safety is designed around these measurements. If, God forbid, you should T-bone somebody, and the bottom of your bumper is above 30", you will go OVER THE SIDE IMPACT DOOR BEAM of a smaller vehicle. I'm sure you know what that means to the occupants of the vehicle. If you hit them head on, you will go OVER THE TOP OF THEIR BUMPER AND HOOD. If that happens, you can ride up the hood, allowing your vehicle to intrude into the passenger cabin. Again, I'm sure you know what that means for the occupants of the vehicle.
For the safety of all other vehicle occupants on the road, please stay within legal limits.