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Not sure if this is an option for your passenger van but I installed my amp and powered sub in the walls behind the driver's seat. I used the panels from DIYvan (Hein) to install a 4 channel amp and a Alpine Sub.
diyvan.com
(I don't remember paying this much for the panels, but maybe I just tried to forget.)

Wall Insert Panel with Built in Box for Ford Transit
Wall insert mounting panel with built in box. Each item is designed for a precise fit in the lower wall openings behind driver. Attaches by clamping against back side of chassis structure. Does not require holes in sheet metal. The outside surface is flush with the surrounding sheet...
