The trunk floor is a BAD location for a sub. It won't sound very good, nor will it be very loud. Your best and easiest bet is the corner-loaded enclosure set-up in the link above, or you can piece it together yourself if you want to save a few bucks.
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Mobridge DA2 > JBL MS-8 > ARC XDi 600/4 > JBL Gti 408 Mids & Vifa OT19 Tweeters; PG Ti2 1600.5 > Morel HCW-10 & IDMax 15
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