I've got too many racks. For our SUV, we have a hitch mounted beefy 2" reciever Hollywood rack.. we could take it 4 wheeling and it would still be stable. Note- on hitch racks you really need to stabilize the wheels so that the bikes don't swing, this rack has that built in.

I have 14 year old yakima trays on top of my subaru, not recommended for taller vehicles.

I have two strap on racks, the $12 gargae sale special is incredibly stable.

You can get roof rack "bras" to protect the paint but I don't worry about it with mountain bikes.

Irulan