I always put the rod on my hood but never my roof or trunk... that way before I drive away I see the error of my ways.
You've probably heard my story about coming alongside a jeep with a flyrod barely balancing on the roof rack.... at 60 mph on the highway! By the time I pointed up at the rack, the guy hit the brakes with a sick look on his face... worst thing to do! The rod flew off and broke into shreds.
I have a bunch of these stories, like Bills RPLX 9wt...