I hated roof racks. After a long ride putting them up there. I have a swaggman hitch rack and i love it.

http://www.etrailer.com/dept-pg-Hitch_Bike_Racks-sf-Platform_Rack.aspx

Here is a link from where I got mine. I have the four bike. Set it in the rack. Pull down the latch cradle and strap the tires and you are off.