Hi Russerath. When I posted my questions about this project, I got crickets. Then I understood why. Turns out my project was more involved than I was prepared for at the time but, fortunately, I was able to find a marine construction company that had just finished a big project and was able to fit me in. Back then, I did not understand the different bunk supports, as I have a bladder style lift and wanted a v-bunk setup to sit on top of it. In the back of the garage at the house we purchased, I found these brackets, which were just what was needed to convert the lift from supporting a ski boat to one that accommodated a pontoon. Pontoon bunk supports have very little rise. I recommend covering the bunks with marine grade carpet, but I am not a fan of wood products around water. Also, I have read on this forum that pressure treated lumber can cause pitting of the hulls. A construction grade alternative, such as Weardeck, which does not have a sawdust core like some of the others, would be my choice. Bunking the entire length of all 3 toons is preferred, although adequately supporting the rear of the center log is critical. Dimensionally, I think 2 X 8's are strong enough as long as you don't try to span too far without support. My v-bunks are twin 2 X 6's with supports at about 3-foot intervals. I later added three pairs of C.E. Smith guide-on posts to help me center the boat on the bunks. Good luck with your project.