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welcopme to the form. daulies over single is nice for single fact that if you get a flat on one you are still safe to pull over or get yoou to the next service centre.depending on makes there is only 500lbs differnce betwen a daulie and a single because you have to subtract the weight of the extra tire weight of the rearend etc.also diesels are better in the mountains because the air is thinner the higher you go.diesels have turbos to force air into the intakes.gas engines like the 8.1 liters have no turbos to force air into it.less horse power the higher you go.
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