Bruce, I have not heard of a regulation on min ride height. If you called the DPS Waiver inspector cited in the above thread and he didn't know, then I would not worry.
The lowest point on mine is the
oil pan at about 4 inches. This is not an area where less is more, unless you have a "track only" machine. Our urban roads here are terrible, with intersection dips and rail crossings being the likely places to bottom out.
Sam