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We tow the 3400RL with a 2004 2500 HD Silverado Diesel with the Allison Trans.
It has worked ok so far but in high country it eats fuel like I eat peanut butter, great gobs at a time. That is due as much to thinner air (less O2) as to mountainous terrain. It also must be babied up long grades or the tran overheats so I do not use cruise control on grades.
When I bought the truck, the factory specs for the 2500 and 3500 were identical. No one at the dealer or the factory rep could tell me why they even had two models if the specs were the same. So I went with the cheaper (not $5 but $10K).
I fell also that the chrvy is slightly smaller and less powerful at this point. The dodge seems to be better and of course Ford has the 450 and up which specs really are better.
I believe the 2006 models have better specs for all three major brands.
Thats my 2 cents.
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