I also use 2'' pipe ladder racks that look kinda like roll bars.
Truck supply place in Santee had them for $80 each.
I use a socket wrench with the hex fitting to take them on/off,takes about 5minutes. Needed some modifications to attach cradles to the 2'' pipe. Also, not quite as tall as the pic below, more flush with the truck body.
Still, most of the time I just hang the single yak out of the truck bed.
