Your search for jeep custom sub box returned the following:

Custom-fit fiberglass enclosure with 10" W1v2 subwoofer — fits 2007-up Jeep Wrangler Utilty

1 person says 

• sealed fiberglass enclosure
• W1v2 10" 4-ohm subwoofer
• installs on the cargo area floor

Custom-fit enclosure with 10" W3v3 subwoofer — fits 2011-up Jeep Grand Cherokee

1 person says 

• black Stealthbox® enclosure fits in passenger side rear cargo area
• one 10" W3v3 subwoofer
• power handling: 100-500W RMS

Custom-fit fiberglass enclosure with 10" W1v2 subwoofer Fits 2005-up Jeep Grand Cherokee (Medium Slate Gray)

2 people say 

• medium slate gray Stealthbox® enclosure installs in the passenger side rear corner of the cargo area
• one 10" W1v2 subwoofer
• power handling: 50-300W RMS
  

Custom-fit fiberglass enclosure with 10" W1v2 subwoofer Fits 2005-up Jeep Grand Cherokee (Medium Khaki)

2 people say 

• medium khaki Stealthbox® enclosure installs in the passenger side rear corner of the cargo area
• one 10" W1v2 subwoofer
• power handling: 50-300W RMS
  

Custom-fit fiberglass enclosure with 10" W1v2 subwoofer Fits 2005-up Jeep Grand Cherokee (Dark Gray)

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2 people say 

• dark gray Stealthbox® enclosure installs in the passenger side rear corner of the cargo area
• one 10" W1v2 subwoofer
• power handling: 50-300W RMS