So I did use the bike rack for the first time - BIG mistake, I didn't realize I had to remove the front bike before
I backed the TT. The bike's rear derailleur scratched the paint off my brand new Colorado's tail gate!
Thank God I went to see my friend at the body shop and only the surface paint was rubbed off. He says a little touch up and clear will be almost impossible to see with naked eyes.
On the way back I didn't take a chance - my road bike traveled in the pickup's bed. No scratches anywhere.