I want some advice as to purchasing subwoofers. I have my heart set on two 12 inch Kicker L7s, but I am concerned about fitting them in my car. I want to keep the backseat to my 1998 Wrangler but also fit in the subwoofers. Does anyone recommend a case that will fit in the trunk? Also, what would be the best way to waterproof the subwoofers?