i'm mainly concerned about mounting the amp behind the rear seat and whether you can self tap screw it right to the rear wall or not (i'm pretty sure its double wall)
Rear wall is not double wall. I selftapped mine to the rear wall but with only 2 very small stainless tek screws. Could see the tips if you looked between the cab and bed.
When i do mine im going to build a frame to mount the amp to out of 1/2" X 1/2" square tubing the remove the bed and screw through the back wall into the frame and seal the screw heads to avoid any leaks. Just my $0.02
There should be some pics of mine in my profile. I mounted the amps to the inside bottom of the back seat. I was concerned about the heat, but I've had zero issues in the last 5 years. I didn't want to screw them into the back cab wall, and I wanted to keep everything easily accessible, so this setup has worked well for me.
yea unfortunatly i cant do that i store my guns under the back seat which dosent leave me any place for subs unless i were to do something in the back doors but that would be way too much work to make work and look nice for my app