Re: 14 GC enclosed sub
JL Stealthbox is the only out-of-the-box option. You could have someone build a custom fiberglass enclosure, but it will probably cost more, and your Jeep will be in their shop for days. Another option would be to build upon the OE sub box: add fiberglass, dampening tiles, bedliners, etc. to beef it up, seal it, and add your own driver. You have to tear nearly the whole rear interior apart in order to get at it.
2014 Durango Limited AWD in Granite: Premium Package, 2nd Row Captain Chairs, 2nd row Console.