I have a 1999 freightliner that I need to use to haul some stuff over a rough rocky back road in Arizona. I don't want to risk cutting up the front highway tires. The freightliner tires are 11r 22. I got to looking at the spare on my M813. The tire size is 11 x 20, but both the 813 and freightliner wheels have 10 lug holes and the pattern diameter seems to be the same. I'm not sure about the size of the lug holes or the hub hole. Just wondering if anyone has ever tried this. If they fit, I could change them out while hauling on the back road. The army tires should hold up much better.