Originally Posted by
badmother
Transfer it to a horse and four wheel cart. You have the two stiff bars, one on each side of the horse ina fairly "stiff" (some give in the harness) connection. Piviot point in the middle of the front axel, under the front end of the cart. You can go quite fast with them as long as you go straight forward or take a big open turn, not a narrow sharp one. I guess the rest is about center of gravitym how wide and how high the cart is and the weight.
Maybe look into extending the lenght of the axels to make it more stable?
Yes, a two tonged fork type attachment that attaches to the rear axle on each side will work for modest loads pulling a wagon. Been there, done that when I was a kid. Brake slowly and smoothly starting sooner then you normally would and take wide smooth turns. Used two lengths of electric conduit pipe with holes drilled in there sides to "snap" around the protruding axle bolt ends on the back of my BMX bike when I was a kid that were duck tape strapped to either side of the wagon handle handle stem. Strapped them tight and then pulled the two ends apart to fit around the rear wheel of the bike and the spring tension trying to pull the ends back to center kept the ends with the holes drilled on the inside edges of the tubes around the stub ends of the axle bolts on the outside of the frame. Haven't tried it since I was a kid (moved on to bigger and better trailer set-ups) but it can be done that way.