Box seems well built. But it will not sit flush under the extended/ super cab rear seat. It's meant for a crew cab. That being said. I had to modify the box a bit by cutting about 2 3/4 inches of the botoom support to be able to slide it in far enough. For it to be flush with the seat.
Was surprised with how well it sounds and handles the speaker I put in it. Alpine SWT10, shallow mount. Much more sound than I was expecting. Great box at a great price. Only issue is the connector housing screws stripped out 1st time I put them back in after connecting the speaker wire.