Nope. Not that I have seen. The tracks distribute the weight well.Very cool and perfect timing! I am struggling between a fiberglass cap or a hard/folding or rigid tonneau. Pretty much settled on the Undercover Classic and also thinking about tracks for it. With the bikes on it does it cause any lifting or twisting of the cover when the bikes sway?
I would definitely consider the Rhino Rack system as they sell it as a kit and for quite a bit less than Yakima and Thule. I got the 59? bars. You cut the track to fit. The main reason though the rhino rack is optimal for the classic tonneau is because you can adjust the mounting bolts to wherever work best since the classic has large support ridges on the underside as you can see in my photos. Best of luck to you!