Thanks @kevinfoutch, super helpful! Sounds like the "recessed clamp" was designed for aerodynamic purposes, but forces some rack owners to effectively put a roof rack on top of a roof rack. :/
I really like the Thule, but I'm thinking it might be easier to get the Yakima Skybox. The bottom is flush and no recessed clamps. But the clamps do look like they are made for those round Yakima cross bars and I wonder if they hold on well to the Prinsu/Front Runner metal bars.
I really like the Thule, but I'm thinking it might be easier to get the Yakima Skybox. The bottom is flush and no recessed clamps. But the clamps do look like they are made for those round Yakima cross bars and I wonder if they hold on well to the Prinsu/Front Runner metal bars.