Yeah, I suspect it would have to be a major re-design to incorporate a trunk in the full size models. However, I think it could be done and would be a great selling point, not that ford needs any more with the F-series anyway. Yes, the Ridgeline never really caught on, but it was a great truck and very unique. It had it's share of drawbacks, which will probably lead to it's demise unless it's re-designed. That's why I'm going back to the F-150 this year.
Still love that trunk though... it'll be missed