I was just thinking of this and wondered if it would work. Put a sub in a board and put the board over the spare tire wheel and then use sealant or caulk and seal the board to the metal and then bolt it down. Would this work? Or is there something I am no considering, i know for a real powerful sub I have have to calk the shit out of it and bolt that bitch like there is no tomorrow.

If that would work, that leads to these questions, the sheetmetal is rigid enough not to flex like a cheap box due to the sub, right? And finally would this cause excessive vibration (more than normally expected ) and loosen shit on the bottom of the car?

Thanks for reading