You sound like a do-it yourselfer, so:
I have Yakama bars with Thule J cradles. No matter what Thule says about them fitting round bars like Yakama; yes they will fit, but they will roll if you are pushing the boats on from the back or front. Problem solved by drilling a quarter inch hole through the bar and along with Thules clamp, I have the J cradles bolted with stainlees bolts washers and nuts that I can easily remove when I want to.
You can also get innovative and save a bunch by getting various rollers and fittings at West Marine or a boating shop, and use L shaped brackets bolted to the bars.
Classic Freestanding Rack
Paddler's Truck Rack
Bent Shaft Canoe Paddles
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