Single Rear Wheel vs Dually - Whats the Best for You

It was my experience that SRW's are good for 7000 lbs in the rear before you need make upgrades or go to a DRW. I upgraded my SRW to handle 9000 lbs RAW and was typically close 8000 lbs. Now I carry even more weight so I have a DRW with a Dana 111.