Deserteagle and Buzzcut are spot on with their takes.
I ran Super Single's on my semi tractor. Had a blowout literally 8 miles from my tire dealer. Aside from the fact that it was -25, my Michelin dealer didn't have a spare in stock nor was there a tire to be found in the Michelin system within a 300 mile radius. Had to dual out the blown out axle to get back to their shop. Went back to duals after that experience.
If OEM's did offer such an option the axles and bearings would have to be beefed up drastically.