So here we go.
Just after I got the Kingston easy entry cart. I still had the 24" bike tires on it, but it didn pretty good on the asphalt grindings and on grass, as well as the arena without being too bumpy.
And in the arena
It's a little jouncy, although I think part of that problem was the wheel size being only 24" and well, it's only got the coil springs compared to the Frey Sprint that has ultra shock protectors or something (but then there's a reason why that one costs 3 grand, y'know)
Sorry it's kinda blurry, dunno what happened to it after I uploaded it. But that's after the 24" bike wheel went flat, and I just said the heck with it, and got the 32" motorcycle wheels Which are AWESOME. Solid spoke, thick tires. So far, so good. I think the height helps a lot, keeps the cart from bouncing as much because it was lower down than the horse. The shafts are level with the higher wheels which is nice too.
Sorry I don't have any video of me driving outside the arena withe the big tires.