Boat AND cab-over? Get the Duramax/Allison...more power/torque than you may ever need, but at least you know it's there. As far as the 8.1, gets similar MPG as the 6.0L for some odd reason (12-13mpg), but at least it's coupled with the Allison transmission, which I understand is ultra reliable. And it has much more torque than the 6.0L(they didn't have an 8.1L in stock, when we bought the HD, but my wife's not complaining).
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