Boat trailer converted to a pontoon trailer

This video is a DYI project converting Shore lander V-hull boat trailer into a pontoon trailer for a 1993 17' Smokercraft pontoon. I had ZERO blue prints for this design. My only reference was one other video I found on youtube.
V brackets found on eBay.
Square tube steel located at a local scrap yard.
all other materials purchased at Home Depot.