Have any of you run your kayaks or canoes on the factory rack/cross bars? If so, how'd it do? I am assuming that there isn't enough clearance to run the boats upside down but maybe there is with enough overhang?! My concern is clearance and how well the factory crossbars handle the load/stress. I'd like to keep from running an aftermarket flat rack on this build if I can and I don't want to be tied to my trailer anytime I want to transport the boats. Thanks for any input and pics are appreciated.