I had an enclosure custom built by Tuan at Advanced Car Creations (ToxicTuan I believe on this forum) for my '96 Chevy Impala SS. It will fit in a larger car like this or pretty much any SUV. It was built for 2 RE SX 12's. It's about 4' x 3' x 2' with two aero ports on each end. I was told it was tuned to 35hz. Cost me $300 to have built. I'll sell it for $150 picked up. I don't have any detailed pics but here is a pic of the enclosure in my trunk.
