For an aluminum boat that is trailered a lot, a bunk trailer would be a better choice as the bunks distribute the weight of the boat over more surface area. As a result, there are fewer pressure points that can lead to leaks down the road. Over time, the concentration of the wieght of the boat on a few rollers can result in the loosening of the rivets, which is what causes the leaks. Bunk slides made of heavy plastic can be used to reduce the friction that the boat has with a bunk trailer, thus making launching and loading from a bunk trailer easier.