Been considering custom-fabricating a roll-pan for my EXT since I bought it. Sensor holes would need to be drilled, hitch would need to be removed (or, alternatively, the spare needs to be removed and the hitch slid up 8-10").
The real kicker on the EXT, though, is that the framerails would need to be CUT. They stick out 3/4" past the sheet metal on the tailgate and inside the rear bumper.
But hey, if DG has a solution, I'd love to see it!
- Tony in MA