Hi everyone. I have a 2009 Audi S4 saloon. The car has become my pride and joy and has low mileage (51k) plus I’ve recently had Gyeon coating applied. I’m considering buying some Thule roof bars and box to give us extra space when camping around 6 times a year. Does anyone have any experience with these? My main concern is whether they will leave scratches or marks on the paintwork.