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Dear tlmrtork,
We have a 2001 GMC 2500 crew cab long bed, with duramax & allison tranny. The duramax pulls our 2005 3295RK not much differently than our previous 99 Prowler TT. The only difference is getting up to speed when going from a dead stop when entering the Interstate. I pull in overdrive without using the tow/haul mode. If you are towing, Trailer Life Magazine does not reccommend use the cruise control, this causes the tranny to shift down to 3rd gear rather than shifting out of overdrive into 4th gear. Also by anticipating grades, the tranny rarely kicks out of overdrive, unless the grade is rather long and/or steep. You will notice an increase in fuel mileage by using overdrive.
Gary
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