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Quoted from Trailer Life 2011 tow guide
"Single or Dual Rear Wheels:
Most people assume that a dually pickup will have a higher tow rating than a single-rear-wheel
unit, but this is not always so. In many cases the gcwr is limited by factors other than the
number of rear wheels and does not change, and in those cases the weight of the wider
axle, bigger brakes and two more tires and wheels is subtracted from the gcwr. The dually
no doubt provides a more stable towing platform for the heavier trailers, although not always
with the highest tow rating. A dually will have a higher gvwr because the dual-wheel
rear axle might have a 10,000-pound gawr, for example, compared to the single-rearwheel
truck’s 6,824-pound gawr. Gawr is not always an exact calculation of the tire capacity
times the number of tires. A dually-equipped truck will be better for hauling a heavy slide-in
truck camper and handling heavy fifth-wheel pin weights because of the weight concentrated
on the rear axle as compared to the conventional trailer’s hitch weight."
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