id stay with 15s going 16 or 17 means more and the load range would be different.
If someone wants to make it work, they will. I am stating that one can run 35 inch duratracs if willing to move up a wheel size. Saving an extra couple hundred bucks isn't a huge deal. If someone is trying to save money, wheeling is not the right sport.
Higher load range tires are generally built stronger, which I would consider a plus for wheeling. Just run less pressure if the contact patch and/or ride is not desirable for one's own use.