I second what Ryan said no need to max it out, don't forget to add your gear to the mix. I had to pipe and say since when does engine displacement have any thing to do with pulling a hill? Diesels make tons of torque at low rpm,also its a intercooled turbo so it shoud have no problem pulling hills. What sets a towing capicity is more often than not the brakeing capicity and frame strength not lack of power.
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