Snugged my platform right onto the factory crossbars with zero wobble, and the two clamps per bar felt plenty solid at highway speed. Install took maybe ten minutes with a wrench.
Eli Y.★★★★★
These clamped my platform onto the factory crossbars with no wobble at all, and the bolts tightened down solid without stripping. Took maybe ten minutes for both bars.
Jacob R.★★★★☆
Solid clamps that did the job on my aftermarket bars, no wobble once I torqued them down. Took a bit of fiddling to line up both crossbars evenly, but the platform sits tight now.