It's really quite simple. Take the best folding stacker in the market, add another set of foam stacker blocks, straps and safety tie downs and you now have a 2 boat carrier for under 130. There is simply no other value like this available anywhere.The Malone Stax Pro2 is the perfect solution for safely transporting two kayaks on factory oval or aftermarket load bars. This package combines the latest technology in vertical fold down carrier design with our new foam stacker blocks. Comes with all hardware, straps, safety tie downs and blocks to carry two kayaks.