Not inexpensive by any means, but I recommend that you save your money and get this Tuffy oversize cargo box for TJ:
http://www.tuffyproducts.com/p-116-0...y-lockbox.aspx
The top will lift with gas struts like you want - and you can modify it with bedliner and cargo tiedowns like I did. Then if you have cargo on top, you can still access the other cargo inside from the rear door.
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