I have a 04 1500 ExtCab Silverado with a 5.3 and 3.73 gears. I pull a 24' with a 1.5 extended tongue trailer, V-Nose United trailer. I moved from Maryland to Colorado last July. The 3.73's made a big difference. I would not have attempted this with 3:42's considering my trailer total weight on my inlaws farm scales was 11.5k with all of our things. I did beef the brakes up to EBC cross drilled and slotted rotors with hawk ceramic performance pads, added Air lift rear bags to keep things level along with a Reese weight distribution hitch to keep it all together. Truck did great and still does very well to this day pulling around my toys. Trailer dry weight is 3675, rated with 10.5k axles. Truck is with stock tune, performance air intake, and Royal Purple fluids all the way around. With 105k on the truck still going strong.
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04' Silverado 1500 ExtCab, 4x4, SWB - 240,000 & still Going, 62' C10 SWB, Stepside - Ole Green Girl!