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There are a few factors that affect performance in the snow. One disadvantage of the dually is the fact that the rear if a pickup is inherently light, the light rear coupled with 4 tires instead of 2 causes a traction problem due to contact pressure. The light weight is distributed onto 4 tires instead of 2 (why the tires spin easier in the rain on a dually vs single wheel) so contact pressure is decreased.
The fact that the diesel engine is very heavy does not help matters much either especially in the mud. I have found that adding some weight across the tailgate makes a world of difference in both traction and the way the truck rides. I lay a row of 16" concrete blocks across the tailgate that weigh about 800 lbs.
John
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