In a recent post I referenced the custom roof racks that were mounted on a team car in Venezuela. Those racks are not your father's Yakima's...
Here are some links that show in some detail just how different a proper team car roof rack is from what's on offer from Thule or the other manufacturers (I think - correct me if I'm wrong):
Pez ProTour Team Cars Story
Google Image Link
Top-9 Cycling Team Vehicles
And who the heck knew there was an entire Wikipedia category, "Team cars of professional cycling teams"? Sweet. I should have gone there first.