Throughout the history of horse drawn vehicles - suspension, and "better" suspension for them, has been sought after by all builders, and even more, by drivers. What suspension does, is "absorb" energy. In practical terms, that translates into "smoothing out", for both driver AND horse, either holes, or bumps, that one might encounter where one drives. In the industry as it relates to driving minis - there are levels of suspension that are being applied, starting from zero - to springs under the seat, to full axle suspension in some configuration or another, up to the actual true ultimate - fully independent suspension. Over all our time connected to driving, we have seen but one cart (photo included) that had a suspension that has the cart body totally suspended in three ways (but no axle suspension) It was designed for ROAD driving, and it would give one quite a ride if they were to try to drive it at anything more than a walk, on rough terrain. Barring that cart - all "catapulting" experiences that we have seen, have happened with carts that had zero suspension, or ONLY seat springs. We have many videos on the Patty's Pony Place FB page that show exactly how suspension works, and I would reference folks back to Barry Hook's video - as contained in the video, the most "severe" testing of independent suspension to date, and it was in fact, the specific suspension that caught Barry's interest in our carts. Another method of adding energy absorption into a cart is the use of "sprung" shafts. These are included in the design of our Firefly cart, and they work amazingly well to "separate" impacts to the cart from the shafts and horse. Last, but not least, pneumatic tires. They do absorb energy, and help with impacts as well, though on a very much smaller scale, pending the exact tires. In closing - suspension "required" works on a gradient scale of where one drives, and how fast one wants to go. With that, the absolute ultimate vehicle for driving on rough terrain, will have independent suspension. For cornering at speed - independent suspension is unparalleled in it's function - I personally refer to it as "corner eating", and that is visible in Barry's video, and in many, many, of the ones I have done at home. In corners, the suspension takes all the "torque" - without it - all of the torque is taken by wheels, cart frame, and horse. Here is a video clip of our independent suspension in action, close up and in slow motion, clearly showing how the suspension is "absorbing" energy.