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In praise of the dually, I’ve been driving my 2003 4wd 3500 GMC diesel dually, crew cab, long bed, for 15 years now and I can’t praise it enough. It gets 21 mpg on the highway, unloaded, and 13 to 14 mpg loaded with a 9000 lb trailer on the ball. I’ve never owned a 5th wheel, but I’m sure it would be a pleasant combination - provided I stayed within similar load parameters. It’s rated for around 12,500 lbs on the ball and 14,500 lbs with a 5th wheel - which means I would personally not want to tow a 5th wheel much over 11,000 lbs, if such a rig existed. Granted, I’ve never approached the trucks’ capacity, and I do use it as a daily driver - but the pure grunt and go, with no sway or stopping problems, speaks volumes for having “more than a minimal tow vehicle.” In summary, I would conservatively rate my choice in tow vehicles to about 75% of the manufacturers claimed capacity
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