Yesterday I installed a jl 500/5 next to the spare tire. This amp was mounted underneath the black spare tire accesory tray and I cut out the right portion of this tray so it all looks clean and I lose none of the space of the trunk area to an amp. The dimensions for the amp are approx 19.5 x 9.5 x 2.5 so if anyone else is worried about room there really is plenty of it. The only issue that may arise is in the summer...will it get too hot in there and I won't know until summer. If so I'll put a little fan in there.So now I have 9 speakers and the music is crystal clear with tight bass.
I installed mine in the same place during the summer, the only issue I had with heat was when I tried to bridge it, it kept clipping, when I ran it normally it worked fine, so I left it like that all summer....no problems