My 12's are mounted under there rear bench, normal car/truck polk audio subs. i dont think there uscg approve lol!

Most people put them under the back seat, I did and worked out good so far. I have marine subs, some guys go back and forth on which ones to use. I got marine because I found some that werent any more money than regular ones and people coming in from the water,spilling beer etc wouldnt ruin them.

I put the amp back there too, as I started out with amp in the cabin under the cooler but the black ground wire I had wasnt creating enough amps I tried 2 sizes and after doing some research you need about a 0 gauge ground wire to do it. Of which at the time I wasnt going out to buy anymore crap and wanted the job done. Amps been in there 3 years no issue. I dont really care anyways as its a throw away amp from ebay its a reman