Originally Posted by skinnysfd
With a dually the narrow the better because when you load it up and weigh her down the tires will squat as well and if you do not have enough gap between you run the risk of the tires rubbing and a possible blowout down the road. I had a dually as well and ran narrow tires until i started modding it and then i was running 22.5" alcoas. Also another thing on a dually is narrow is better in case of snow to much tread on the ground and you will really hate the dually in winter driving.
I drove from Newport News, VA to the western side of Michigan to pick up a wrecked 12v CTD 5 spd 4x4 3500 dually. I was in snow (very heavy at times) from Maryland to Michigan and then back down to Richmond. The temp never went above 17 deg the whole trip from Richmond on the way out down to Newport News on the way back.
I never had any issues with the tires or tracton, in fact, the only time I slipped the tires was when I had to stop for a light on a hill, and then they slipped for about 2 revs, and that was it.
Now, granted, the 4500 lb GN trailer and the 7000 truck on it probably helped on the return trip, but no truck on the way out there.
Imagine having to turn around in a field that has 2-3 ' of snow in it when you are hauling a 24' flatbed gooseneck behind you dually. I put her in 4 low, and just drove, she chewed thru the snow with no issues.
I ran the same width tires as stock, but mine were slightly taller, because that's what was on it when I got it. I also had the GM wheel cylinders on the rear axle, as it gave more braking power back there.