No rear tank, the chassis (frame) is modified to fit a spare wheel between the chassis members, these carry three spares when on operations.
They indeed have two fuel tanks, similar to Series tanks, under the seat box. They also have racks for four jerry cans.
They are a three seater, two in the front, one rear facing at the front of the tub, the ROPS and canopy is raised to provide the back seat passenger with less headaches.