"also a major advantage of having a single dual rear wheels and 2 tires on each side is if you do have a tire failure then you have a built in spare right there at that point
so no I would not do that"
Amen! Had a rear tire blowout on my F350 SRW a few years ago while packing a camper and was very lucky I didn't roll. All that weight way up high and all of a sudden one side of the rig instantly dropped 6". I was only doing ~ 45 mph at the time - hate to think what would have happened if I were at freeway speeds. I never forgot that experience, so when it came time for a different pickup I considered only a dually.