Like wovenrovings sister I have a water tank under the driver's sill.
Also, note that on the Isuzu installation, the exhaust is outside the chassis, leaving a large space between the transfer case and the A-frame crossmember and between the prop shaft and the chassis rail. On mine this is filled with a fuel tank, but part of this space would be useful for a locker accessed by a hatch in the rear floor panel on a wagon.
On a ute (especially a traytop) there is on any Landrover a good big space under the front part of the tray. In the sixties my 2a had a large water tank in this spot. Ute bodies can access this area by cutting doors in the panel behind the door, providing access in to the chassis rail, and there is even an outrigger to support large weights.
John

