Thanks for the replies. I think the 3 plank set up would be a very cost effective option for me. I would need to come up with guides. Although the toonrail system helps to guide the boat in from what I've read, but with a much higher cost.
I have to convert my ShoreSatation boat lift for my new 18 SVL tri-toon. Question is there are 3 types, tripple V bunks or 3 flat planks and ShoreStation makes one called Toonrail. Which type would be best for my Bennington pontoon and approved by the manufacturer.