Matt,
Nice find on those wheels. I searched high and low for a suitable and affordable air-filled wheel. Clearly you had more success than I in sourcing the part. And I searched a lot!
One question though. What is the hub configuration of that wheel? This entire thread was started in order to solve the "hub" issue - which ,as it turns out, is no minor problem unless one wants to use the standard metal trailer hub assemblies (4 or 5 bolt configuration, heavy and rust prone).
That is why I went with the plastic wheels with the 2 inch diameter bore. It is much easier to convert over to our purposes while avoiding metal parts.
Dave
Good question on the hubs. I emailed the supplier this morning and will report my findings. The photo shows a hub but I have a feeling that they are just selling the tire. I think the standard ATV wheel has a 4 bolt pattern. I might end up machining a hub out of UHMW. I need some more lathe and mill experience anyways.
