(Click thumbnails to enlarge)
First sanctioned NATVA race was held in Baraboo Wisconsin
Here is a flyer for a NATVA Grand National Championship event in Pine Knob Michigan.
Here is a flyer for a NATVA event in Bethlehem Pennsylvania.
Here is a picture out of a NATVA magazine of a sanctioned race. Don points out that they don't even require roll bars on these racers!