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Tires are Pirellis Scorpion all seasons extra load..Is your boat trailer suitable for a WD hitch install ? If it isn't design for one, you run a real risk of liability, damage and possibly an erratically handling setup.
Also, what tires are on your truck now. What is their load rating? If you're going to be hauling an 8K trailer around.... e-rated tires are highly recommended.
.....also, many boat trailers use surge brakes because of regular water immersion. As a whole they will be incompatible with a WD setup as most WDs will change the physics that surge brakes need for proper brake application.