One of the cool ideas I saw from the JK Forum is a RotoPax fuel can installed in the rear side window location. The rear side glass is useless for visability with all the other gear in the back - so Rebel Off Road fabbed up a recessed cut-out that housed a fuel can. Pretty slick idea - not sure if the 40 glass is tall enough to accommodate the size of the RotoPax or not. Just ideas.