5,000lbs should be an easy pull- I pull tractors and dump trucks every now and then on a trailer.
From memory (and that's not what it used to be) but doesn't it say somewhere in the owners manual about trying to stay above 20mph when towing heavy loads to avoid damage to the transmission, therefore I guess if the road doesn't allow for 20mph, you might want to change to low.
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D2 with stuff added
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