Most of the class I took was done on a large grass field. The instructors laid out the course using small cones. The last series of exercises were riding over 4"x6" beams and some other small obstacles. The best part of the class I took was that we had an opportunity to take a long off-road ride with our instructors after the "official" part of the class was done, applying new skills right away in the real world.
The grounds requirements for the main class aren't all that onerous, I think the post-class ride would be more difficult to arrange. Though most grounds crews hate the idea of somebody riding around on their turf so I could be wrong on that one.
I will do some more research into what exactly is needed to put on the class, if it looks something we could do at the Rally, I will put a package together for the committee to consider.