Sound Deadening Back of Regular Cab

what have y'all done on the (relatively) cheap to deaden out a bit of the tin can ness of these things? i've thought of just doing like a couple thick coats of spray on bed liner...

anyway, any input would be nice...i'm wanting to put some speakers in the back trim panels, so getting rid of some of the road noise would help with that too

 

I used a combination of carpet padding and quick roof. The quick roof worked pretty well and was super easy to install, the carpet padding was mostly a waste of time.

 

nvm am idiot and can't read, i guess...........

anyway, i'm guessing you put the carpet on top of the quick roof?