I've been thinking about this too. We're a family of three and I would much rather have a few inches extra cargo space than an empty back half-seat. My ideal would be a short-back bucket seat mounted in the middle so that the boy-child can see something other than the back of my head. Aside from securing the seat itself, the challenge is in getting the shoulder belt in place. Maybe a roll-bar hoop bolted to the tub and running up behind the seat? It would all need to be removable but it wouldn't need to be quick.
(It's all made more challenging by the fact that I have zero fab skills or tools...)
'06 Solar Yellow Rubicon Unlimited --
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