Alright, I have a cheap rack for my commuting needs for work. However, I never feel secure with that, but the ride is only 10 miles. However, I have just purchased a new compact mini van and was thinking of getting a roof rack with a locking system. This would be for the longer trips that would require not being next to the bikes at all times for stops and such. Im always affraid of scatching up my road bike and mashing it on a rack with 3 or 4 other bikes doesnt sound good to me. How complicated are the roof racks, do they need to be professionally installed?