Finished the dual under seat battery install... The 2 outer posts secure the tray to the floor and stay in place and the centre one comes out, this makes removal of the batteries easy..
Back of the perko switch gets a bit cramped..most of these are small current wires for the diesel heater and power for the additional under seat and engine bay fuse panels..
Cut up some old yoga mat I had laying around, this works excellent as a battery pad, stops any chance of them sliding around..not that they can go too far..
Knocked up a quick hold down bracket...works great..
Front side of the perko switch recessed through the face of the battery box, you can also see the 10 amp resettable circuit breaker, this maintains power to the radio memory, clock, central door locking, alarm and interior lights etc when the switch is turned off, but any larger drain and it pops open circuit...if I want to totally kill the power in the truck I just turn the battery switch to the off position and turn the ignition on, it's enough to pop the breaker and then there is no power at all...