so, at what point is one considered to have crossed the line from cj7 to buggy?
Last year they had three classes (correct me if I'm wrong). 35" tires and under daily driver (must be street legal), 36" and over daily driver (again, must be street legal) and then open class (anything goes here).
So if memory serves me correctly, you would be a CJ7 until you were no longer street legal. But if you wanted to compete in the open class, you are more than welcome. Actually, if you qualified for the 35" tire DD class, but on the day of the event you saw the others, and fealt there was no competition for you there, you could move your rig up a class to wherever you wanted. You just can't move down a class.
And to be clear, street legal doesn't mean you better have mud flaps or your a buggy. It just means you need to have all of the correct equipment to have it registered. Seat belts, lights, fender flares, etc.