In case anyone is interested in the foam filled tires. I ended up getting one new 10x16.5 no name brand r4 tire for $166.00 total. I found a tire guy who would send out the tires to be foam filled for $106.00 each. The foam they use in this size tire is not as hard as they use in bigger tires. The tire man looked at my old tire (74 hrs,) and said it was in good enough shape to have it filled. The reason for having new, or like new tires, is just for the wear factor. He recommended that once the tires had a little less than half an inch of tread left, I have them retreaded. I also asked him about the durability of the retreads. He maintains that retreads are 100% better than just a few years ago. He also maintains that the main reason for tread separation is heat, and speed, which will not be a factor in my tires. The only downside I see right now, is that the tires will weigh close to 200#, and I have to put them on in a muddy field 2 miles back in the woods.