I think that "separation of the truck bed" is a fuel tank;
"...Mega Cab with an 8-foot bed and an oversized mid-mounted gas tank that combines with a second frame-mounted tank and a third auxiliary tank in the bed for a maximum capacity of 170 gallons. That gives the 6.7-liter Cummins turbodiesel engine a range of around 1,700 miles per fill up."
Apparently, the writer of the article does not know that diesel trucks don't have GAS tanks!
170 gallons on board! I would only have to fill that thing every two months!
Not that I would ever buy one.
For one thing, it would have been a better idea to build a sleeper in the cab rather than the Mega-Cab!