I cycled for years. Still have my dual slalom bike but have since sold my road and XC bike. Would like to hit the trails again, myself, sometime.
This is what your looking for:
http://www.saris.com/product/bones2
They make a 3 bike as well. Has locking options, strong as hell, won't scratch and the arch-style clears spoilers etc. Outside of that....they have a slick look.