Hard to argue with a lot of that math. I had a quick look on ebay, and the other tire brand available is speedway. They are $105 USD each shipped to anywhere in the US. That makes the math a little more favorable.
https://www.ebay.com/itm/5-NEW-Milit...H6D:rk:18:pf:0
https://www.ebay.com/itm/4-NEW-Milit...H6D:rk:20:pf:0