Isn't a tank slapper known to the engineers as a 'dynamic coupling' whereby a confluence of forces (i.e. sideways, up, down, angled) come together to create the tank slapper itself. I recall seeing a 'speed bump' in a parking lot one day and something told me to try and initiate a tank slapper at low speed. Thus I rode over the bump at about 5-10 MPH, literally slapped, or jerked the right handlebar, and sure enough, the bars started to wobble...fairly violently, at as low a speed as I could maintain the bike upright. The 'slaps' happened for a couple of feet, but I was able to ascertain that under the right conditions the tank slapper can occur. I don't recall if my steering damper was 'just-biting' or if I had it loose. Ever since I know I have kept the damper a bit tighter than just biting, and if I see I am about to run over a pothole my whole upper body gets stiff as I'm locking my arms onto the bars. Thankfully, I've never had a tank slapper, other than the day I bought the bike. I was riding home 30 odd years ago on the 'freeway' , the speedo cable broke and I foolishly said, "Crap, and slapped the speedometer! The bike went into a slapper, right in front of a huge truck. As I recall it was going down to the right, and as I opened the throttle, it seemed as though I was able to wrench it back upright without going down. The incident scared me so badly I parked in a truck stop for a couple of hours. A trucker came by, talked at length, and we loaded the machine onto his truck and he drove me the next 100 miles to my destination. I avoided disaster and this was after riding the machine about 250 miles or so. I think any two-wheeled vehicle can go into a tank slapper under proper conditions. Remember, my test was done by going just about as slow as one can go and still keep the bike upright.