I'd go Al's Liner product HNR (Heat and Noise Reducer) under a liner product (like rhino liner or Al's has their own liner product) as opposed to Dynamat. Unless you want the most noise reduction, AND to top it with carpet specifically. HNR and liner in the cargo area, dynamat and carpet in the front.
While all that stuff is out, there's nothing you'd need to run, unless you want to run power back there for something. power outlets, USB outlets, speaker wires, etc. All that wiring could come out of the floor (rear cargo passenger seat floor) up to the walls.