As has been hinted already, the types of people who own boats or are into boating disproportionately support Trump because they're mostly old white Boomers in the Sunbelt who have the disposable income to spend on an expensive hobby. In a similar vein, I bet if you go to the Sturgis Motorcycle Rally (which is still happening this year despite the Coronavirus, though perhaps it's somewhat understandable because if they don't do the rally, there's basically no reason for the town to keep existing), probably 90% of the participants will support Trump for similar reasons.
Just old people with expensive hobbies that "can't afford" to pay any new taxes?