Very good idea TJ! With the metal one though, I would worry that it would get really hot in the sun, and also cause a glare on the back window when the sun hits it. Just something to consider, it might be okay after all.
I just use a colapsable "bucket" in the rear to keep stuff from sliding around and whatnot.
I just use a colapsable "bucket" in the rear to keep stuff from sliding around and whatnot.