I spent alot of time looking round the 4x4 shows and looking at other peoples trucks, i then designed my own system that bolts to the seat and seat belt mounts, the original design shows an aluminium channel, this holds 3no 20lt jerry cans. Once it was in place i found there was room to move that to the left hand side and mount it on "L" brackets, there is also a similar setup to the right, this holds a 25lt water tank and 2no gas bottles, the water tank is pumped to a tap on the door.
Incorporated into the design is my cooker that slides out complete with 2no storage boxes, the cooker can also be permanently connected to the gas bottles.
6no gommo boxes slide underneath, also a removable 35lt fridge is fitted.
I have also slung a net across the ceiling of the truck to carry light stuff.
I had the metal framework made up by a local blacksmith £150, i then bought a sheet of 1/2" WSB plywood £30, cheap carpet £25, ancillaries glue, nuts/bolts/paint £50, total £255, buy a pre built one for £600 to £800, so massive saving to be had!