This is a long shot but I figured I'd give it a try. My Aunt and Uncle were very much involved in driving at one point in time (from Canada, but I believe they participated in US events as well). They traveled frequently to and from Europe competing and had horses for years. Unfortunately, I have no idea what the details are, but I'm interested to see if there are any highly competitive individuals who drive on a National level on this forum. If so, I would be much obliged if you could PM me for additional details. My Uncle passed away a few years ago, but I'm still very much interested in learning as much about their equestrian history as I possibly can.