Tailgate ain't that big...pretty sure even shallow mounts won't fit IN the tailgate...lol
I had a single sealed 10" in the back powered by a 400w amp...all Elemental Designs with KnuKonceptz wiring. It thumped...even with the top off. Ended up selling part of it off as I was dating a girl with a 6 yr old at the time and needed the functionality of a backseat again. Then she dumped me like a month later and I was kicking myself for ever selling that stuff off...stupid women.
"We don't build great brakes because we think you don't know how to drive, we build them for the guy on the road in front of you that doesn't." - Black Magic Brakes