Really boils down to: how heavy is the coach, how heavy a load is being towed and how much mountain driving do you intend to do. My '92 has the 8V92TA, 500 HP. I weigh 45,000 pounds and tow a 3,400 pound car. I travel enough in the mountains to want all the power I can get my hands on. I am currently in Lusk, WY, elevation 5,034' headed for Cheyenne, Denver and Albuquerque. Wouldn't want any less engine than I have.
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