The Mega Cab is based on a Quad Cab-long bed frame with a 160-inch wheelbase. Engineers then swapped on a short bed. That left about 20 inches of real estate for designers to stretch the cab out to 111 inches long. The bigger cab now has huge rear doors that are 34.5 inches wide and can open out to 85 degrees, making ingress and egress among the easiest of any vehicle on the road. The wide openings also allow for quick cargo loading and unloading. With the rear seat folded down to offer a flat load floor, there is 72.2 cubic feet of cargo volume. That’s about 10 cubic feet more than the cargo space available behind the second seat of a Ford Expedition.  Engineers didn’t mount the rear seat against the cab panel. It’s forward enough to provide 7.7 cubic feet of cargo space behind the seat. Also, the 60/40 split rear seat reclines from 22 to 37 degrees for added comfort.

With rear-seat passengers so far in back of the cab, Dodge engineers had to quiet down the interior so normal conversations could be held. New cab mounts, extensive use of Polymer Constraint Layer (PCL) in the front dash area and laminated glass improved help isolate road and wind noise. In fact, Dodge claims the Mega Cab is 20 percent quieter than the previous Ram heavy-duty models.