I took two sit on top Malibu kayaks (30" wide) and made a car top carrier out of 4 cedar 2" x 4" x 8' long lumber. Basically an H shape frame 8' long by 5' wide (holds two 30" kayaks) the center part of the H being a platform of half inch plywood 5' x 4'. Added 4 large eye bolts on each 8' side to secure the kayaks to the rack when transporting on the car roof. When we got to the lake the kayaks were set parallel to each other on the shore about 3' apart. The rack was then taken off the car and flipped over turned 90 degrees and placed over the kayaks. Two ratchet straps were attached to the outside eye bolts, the under the kayak and back to the inside eye bolts, then across to the inside eye bolts of the other kayak, under that kayak and tightened after being attached to the outside eye bolts of the second kayak. This made a catamaran with a 4' x 5' platform for an ice chest and camping gear as well as a transom for a trolling motor. I sometimes used a tall chair to fish from but eventually just added a resting bar so I could stand and cast. When camping the rack came off and 4 legs (paddles) were installed and a tarp attached to form a tent. I was a great set up for my wife and I as we got older we could motor to far away areas then use single kayaks for narrow slot channels at Lake Powell, and got lots of looks when at the beach on top our Baja Bug.