Point is that the frontier with a V6 should be able to handle 2,000-2,200 lbs. comfortably. If my 4 banger can handle 1,500 lbs. in the pocono mountains, you should have no trouble. Just check the weight of the boat you are thinking of upgrading to. I don't think too many 18'ers are in excess of 2,200 lbs. Maybe a few fiberglass rigs with high output outboards....maybe.