yeah, i ahvent seen it on a pickup but they are running them on 18 wheelers and such. they apparantly handle better. seen 'em goin down the highway quite often. i would think that they would do excellent with a 5th wheel/gooseneck
The reason you are seeing them on 18 wheelers again (this is the second generation of super singles, the first generation was a flop because they were horribly designed and had a very high failure rate) is because of weight. Look at what rigs you see them on, tankers, canadian spread reefers and flatbeds. These have a significant weight savings over conventional duals and the new generation super singles has the quality that standard tires do. That being said, most big rig drivers (myself included) prefer the standard dual tires for several reasons:
1.) Blowout - you blow out one tire on a dual setup, the other will carry it to the next repair shop
2.) Wet performance -Duals consistantly perform better in wet to flood like conditions, same for snow.
3.) Cheaper - Only the owner operators have to worry about this, but super singles are more expensive in initial cost and to replace over standard duals