I realized the other day I never did a follow up to this thread. I ended up buying tires made by Solideal. The treads resemble a Bandag retread I often see on heavy trucks for winter use. I bought these along with six tires for my F-550 at the same time and the dealer cut me what I thought was a pretty good deal.
The tires as pictured now have about 200 hours on them. So far they're working out pretty well. They don't skuff up the turf as bad as the original tires (construction tractor tread) and don't hop on pavement as bad either. The down side is they don't have quite the traction that the originals did in mud. I can't push into a pile as before with these tires after a rain. I haven't been stuck yet, but there's no traction for pushing.
Another problem is the tires load up with mud easily, which then gets tracked onto pavement. The picture on the bottom shows one pass over pavement after crossing a construction area during rain. We had to spend about 10 minutes cleaning up from this.
All in all, I think these tires will work well for me, they worked fine in our snow operation and the benefits outweigh the downsides so far. I'll keep you posted on the way thery are wearing as time goes on.