dvsdev
+1y
My workmate had a 10" in the jack area of his hilux when he bought it, the guy had done his best to seal it up but there was just too many gaps to get them all, the sub just couldn't punch so we tried filling everything with space invader and gaffa taping all inside, that helped a little but it still sounded pretty weak.
So in the end we made a box that sat behind his seat on the floor and that kept him happy for a while.
You could probably make a sub go in there but I would think to make it worthwhile you would need to cut a hole in the seat frame and fiberglass a whole box in there instead