One caution I would offer. You should not use rollers on aluminum boats as it puts undue stress on the bottom of your boat at each point where the roller touches the boat. You might want to try some of those "slick sticks" you can attach to your bunks, or do as I'm going to do. I just had back surgery after jerking my 18 ft Wareagle around and popping a disk, so I'm gonna put a power wench on my trailer. At about 200 bucks that seems like the best solution for me.