Its the roof rack system we've used on our own vehicles for many years before we became a Front Runner dealer and one which is built solidly enough for the rigors of off-road travel. T-Bolt inserted in Crossbar channel.We proudly work with Front Runner to deliver our customers with the Front Runner Slimline II roof rack system and load bars. If it gets messed up, I'll just peel it off and apply another piece. I also put Oracal brushed finish metallic-look vinyl on the top surfaces of the cross-bars to prevent the Skybox from scratching the finish. Sealing the Bottom sliders with Plexiglas strips and RTV Sealant I use a large neoprene washer the size of the mounting bolt, then a stainless fender washer, then a lock washer, then a knurled nut that I tighten down from inside the box. The bolts come up from the crossbars into holes I drilled into the Plexiglas strips, and then I drilled holes into full-length 1/8' thick aluminum bar stock that runs the length of the box in that area to reinforce the mount. I also took the sliding plastic pieces that allow the clamp positions to be adjusted out and cut strips of Plexiglas that I sealed in to the box so it's not completely water tight. I cut the rubber that resides in those channels at the fastening locations. What I did was make Custom T-bolts that lock into the channels on the Roof Crossbars at set positions. Here's how the original setup looked with the rotated clamps. My mounting method has now been tested over 2,000 miles at speeds up to about 110 MPH - no issues and the Pano Roof will open while it's installed. My solution using the clamps was to attach the front ones from the front pointing rearward and the rear ones from the rear pointing forward, which made me feel like the box would be secure under any circumstance, but no way the Pano roof would clear those when open and I was afraid that someone would accidentally turn the **** and damage the roof panels or mechanism creating a $5,000 replacement situation so for peace of mind I had to come up with something different.

When I originally put it on the car, I had the same clamp issue you're describing and was afraid that if I put both sets of clamps on from the front aiming rearward that it would be fine underway, but under heavy braking or in an accident might become a forward flying projectile.

Maybe you can do something like I did to change the mounting method for my Yakima Skybox.

Roof cross bar channel t slot bolt