Technically, it is likely way over the 1000 pound tow rating of the 2.5. I would guess (a real guess, because there are probably a lot of variations of this manufactures boats) that boat is close to 2000 pounds, and the trailer 600-800 and added equipment, probably close to 3500 pounds.
While generally it is stopping ability that is most critical, I would also be worried about getting stuck on the ramp. I am not sure I would chance it, even for a mile.