Ok, thanks! I was going completely wrong! I was looking for tires that were way too wide.

From your tire size I was able to find a lot of other good candidates at tire rack. My favorite so far are the 255/65R16 size. That's about 29.05 tall (almost the same size as stock F100 tires), and 10.04 inches wide. Your tire is 31.73 inches tall, 9.25 wide.

Thanks again for the help!