[kgzak]

You can attach bearings to the shaft and have to the gearbox turn that shaft. Use bearing blocks or something to that effect and hold the bearings with the shaft and then attach the output to the shaft on the bearing blocks. We tried this our second year and it would have worked, if we had the right gear ratio.

Or

Use Hubs and attach the wheel directly to the output shaft of the gearbox. Assuming your shaft is long enough to get the appropriate hub and spacing on it. This is the method we now use. It's very reliable and not as many fail points.