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There's problably a good way to mount them in a weather resistant box in the bed somewhere. The PO had one under my driver's seat that worked pretty well but that's all tool storage now. Good luck with the speakers and bumper. 

I called Matt a wile back in case you wondering, IIRC @ $30-40k for the baseline steelies and @ $90k (again IIRC) for the aluminuminum.