is offered by a van rental company. They put them up for sale after they hit about 45000 miles or so. They still rent them out. I have bought one of their dually vans and we love it. We have had no major problems with it.
You mean the outside wheel of the dually? it is a dually style rim setup. It is a conversion they have done after they purchase them. I cannot remember the company who does it, but was told it costs about $7000. That includes the fenders and lights etc. I specifically went searching for one that was converted as it helps with the stability in case of tire blowouts. The E series has such a high center of gravity when it is loaded. In 33% of all accidents involving tire blowouts, there were rollovers resulting in fatalities.
Converting the front is easy, you buy a dually hub/disc, the rear is a different story, you can buy a spacer, or look for the van dually axle, I hate spacers, they require removal to service the rear rotors, also require cutting the stock wheel studs.
The company that converts them puts in dually axles. At least that is what I was told. There is a sticker on the door with the info on who converted it, but I have not read that since I first bought the van over a year ago.
It came out of a box van I'm sure, I can't afford new, I was lookin for used, the place had wrecked ambulances, not looking at that stuff now, would like a wider axle tho, dually isn't street practical.