Hi Tom and Donna.
We have a 3670RL and pull with the Duramax 2500 GMC Crew Cab w/ Allison. Pulls like a dream. One hint you might be interested in. The GMC comes with 245 x 75 x 16 tires. The unit probably weighs about 14100 lbs. An alternative to going to the dually is to upgrade the tires to 265 x 75 x 16. This gives you an additional carrying capacity of about 3000 lbs. Otherwise the 245's are really close to their max. carrying capacity of around 9000 lbs.
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