I would like to remove the stock alpine all weather subwoofer in the rear floor to gain storage space. Is there a locking cover that I can place over the open space?
My recommendation is to swap your lid with the OEM floor from a wrangler that did not have the subwoofer. It is locked by the rear door; the door closes over the front of the lid which prevents people from reaching back there and lifting up the cover.
I found this one on ebay for $199 but I would check your local salvage yards because I feel that you could probably pick one up for a lot cheaper than that.