Gettin' up the hill fast is not gonna happen with any coach. But remember the real problem is coming down. With 40,000# or more (way more) you want to come down slowly so you don't burn up your brakes.
My 1993 39' with 8v92 & 500 hp towing 6500# goes up at 35mph in second gear. About the same speed as truckers and most all other big coaches.
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