I have seen exactly one, and it was on the road, being transported by a car carrier.

Yes, +1 on the third way.

I have become a fan of the design, with its easily-convertible (hah) vents be damned. I would consider adding one to my fictional garage, at the bottom of its depreciation curve, of course.

Heritage, I guess?

Seminole Dragway in Tallahassee, Florida. Closed down in the 70s.