I recently bit the bullet and invested in a Yakima roof rack for my bikes. (I think the model is called "socket rocket" or something like that). I'm totally loving it -- sooooo much easier and quicker than my old trunk rack, and I feel better about driving with the bikes (I used to always be worried I'd get rear-ended). I've also been impressed with how solid it is -- try to move the bikes and the car rocks.
I bought let's see, I think six lock cores (one for each of the four rack-to-car attachment points, and one for each of the two bike-to-rack attachment points). The salesguy told me that this would make it virtually impossible to steal bikes from the rack.
But I still don't feel comfortable leaving bikes on the rack if the car is going to be out of my field of vision, even for a short time. Anyone else with a roof rack have an opinion on this? Am I being a little crazy? How safe do you think it is to leave bikes locked on a roof rack that is locked to the car? Would you, say, feel comfortable leaving the bikes on the car to go have lunch? (I don't).
Thanks!