Here a cheaper way .
http://www.pickupspecialties.com/Adv..._tent/tent.htm

I probably going to build a custom rack. Yes i know it will cost. The
design is already done. I want the ability to put things out of way
securely . This cheap route doesn't allow me to secure my sea kayaks
without going to a custom rack . No matter how i look at i will need a
custom rack. How elaborate will be matter of cost.