I did it a few years ago with our brand new van with a kid trailer on top. Didn't really hurt the trailer but it broke the crossbar off of the roof rack. The best thing I would recommend is to hang something from your sun visor when you have the bike on top that hangs down just enough to always see it. Like maybe a little toy bike. We have a motorhome and a common problem is driving out of campgrounds with the folding antenna up. I now hang my ignition key on the crank for the antenna when it is up. I have gotten in the drivers seat more than once and wondered where my keys were then remembered the antenna was up. Good luck with your repairs.