My driving story isn't exactly about my horse being driven . . . a bunch of people from our barn were out at the Conyers Horse Park, riding the Olympic 3-Day Event course, just to say we'd done it. (The course has been completely neglected, because that stuff is way too big for any ordinary horse. We kept looking for something small enough to jump, just to say we'd schooled on the Olympic course . . . but all the small stuff had hedges which had overgrown horribly . . . no luck.)
Anyhow, a bunch of harness eventers were out there practicing. We came over the hill, and a pretty chestnut was between the shafts just trotting along. It was a black competition 4-wheel drag, and the wheels had bearings that made a soft whirring sound. Our horses took one look at that and had hysterics! Even Gracie was snorting and shying. A couple of folks came off.
Best I can figure, they thought the cart was a big black monster that was in hot pursuit of the chestnut and was on the point of devouring him!
First I'd have to have a harness that even fits. I've looked at a couple harness rigs at barn sales :~) But she's too big for small pony stuff, and too small for horse stuff.
Bob taught Prez to pull a cart with essentially that. It was a sled so in the dirt and sand it created quite a drag.