They were designed and tested by DELPHI-Steering Division which is just down the street from our shop. I understand that you can still get them but they will be discontinued soon because of lack of sales. I think they only make the 1/2 ton version. A tell tale sign of those equipped with them can be seen by a slight flare in the rear fender well, not nearly as much as a dually but just a slight bump.

I understand it is a costly option and does work pretty cool. One of the guys I went to college with in Engineering school did allot of testing on it in Michigan's U.P. in snow, ice, etc.

I've never driven one, but the ads I've seen seem really cool for backing trailers in tight places. I need a 3/4 ton truck. As I've driven past the plant, I've seen a number of them turn into the driveway and you can see the rear wheels turn. Looks kinda odd! I've also noted that the rear wheels have quite a camber to them which would make me think "uneven tire wear". The only ones I've seen on the road were driven by DELPHI engineers in and around the plant. Don't think this got much industry acceptance.

I think one of the Jap car manufacturers has this feature on one of their cars.

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