Ooooooh! Oooooooh!, put an idler wheel, near the seat section, and put a spring, or
shock absorber, on it, and put one more idler in between that and the rear, and put
tracks! We used to make tracks for our half tracks with split conveyor belts, and then bolt on the cleats, that were "U" shaped in the middle, and angled flat on the ends. You would have one BOSS cart!
Wayne