I've used the Thule version of the tailgate cover for years and never had a problem. Very easy to put the bikes in the back of the truck with their wheels over the tailgate. No damage to truck.
This covered the backup camera on our new RAM, so we also have
a bed rack like this one.
For short trips we use that. For longer ones I have fork mounts on the underside of the dinette seats. Remove the cushions and flip the board over, instant bike rack inside the TT.