couple of thoughts, as a ford f250 owner and product follower.
the Ford diesel engines from 2003 thru 2010, 6.0 and 6.4 have terrible reviews, a major repair could cost close to your buying budget.
I can't speak to Chevy or dodge...
Imo, I would have your boat and trailer delivered if possible, giving you time to figure out how to tow it the shorter easier distance. if you can swing the cost of a newer truck, 2015+, with good maintenance and low usage, the truck will hold its value pretty well, and could be used as a driver while you own it. thanks for sharing your adventure with us, good luck!
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All Dodge I was thinking the same thing! Rent for the ride home store the boat and have time to find a good deal
This also crossed my mind