I didn't set out to get a dually, but they offered me such a good deal that I just couldn't say no.
It's a bit harder to maneuver in traffic, but not that much harder. Just remember to swing a little wider on the turns, and use the rear view mirrors when backing. You can fit it into a standard parking space, but just barely. I think a lot of this comes not so much from the duallies as the crew cab and 8 foot bed. Watch out for concrete lane dividers, they can sink between the rear tires and tear up the sidewalls.
Tire cost. It's an issue, but remember that a rear tire is carrying half the weight. With a good rotation schedule, they'll last longer. End result is that you'll pay more, but not as much as you might think.
Pulling power? You betcha! I was dragging a big oak log yesterday, first time I've really put Big Duke to the test on the farm. Definitely pulls better than single rear wheel. Had one big trailer on it. Don't know if it's the F350 or the dualies, but it sure keeps a load under control.
Bad weather - I've been through a couple of major thunderstorms, and very high winds. It pulled right through. Again, not sure if this is the F350 or the rear, but I've never driven a truck that was this steady in bad weather. Wind doesn't faze it - just be sure a car doesn't get blown into you.
Finally, appearance. Now, I know that's not a big factor in buying a truck (yeah, right), but there's something about this big, hulking monster that looks right. Clears a hole in traffic. Even the dumbest clod in the biggest suv gives this monster a wide berth. It projects a tough, purposeful, 'dam you fer lookin' appearance to it. Yeah, I'm a big truck. You wanna make something of it?