I once had a horse cart (full size) without springs. It was okay, but definitely would jar you if the ground was rough at all. Those two little springs many of the EE carts have under the seat really do make a huge difference in comfort. It doesn't look like that cart has any means of balancing it (by moving seat or axle) so it may not sit properly on a lot of horses. If your horse is just the right size it may be okay, but if it isn't it will either put too much weight on his back or be pulling up on the girth/wrap straps