Always someone out there able to help you, if you for instance have a Porsche and need to pull a caravan… check out http://www.willwoodsystem.com/
As crazy as the Koenigsegg Agera R and Thule Lightning
But still, maybe not so crazy after all, all the time Jon Olson has mounted a skibox on his Lamborghini Murcialago, the LP 670-4 SV Olsson Winter edition version, see pictures at http://www.jon-olsson.com/?p=1063