I have fitted a 70Ah in the 2.8 engine bay - it is however in the same direction as the crank battery and not sideways.
I have built a rectangular platform from flat aluminium, fitted that to the fender and then a piece of marine ply on top with a battery clamp across.
Sofar it works fine and is quite sturdy.
The little pump thingy I think is for the difflock, if I am correct. I took the bracket off and just put it the other way around, i.e. it is now facing the intercooler / engine.
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2003 Colt Rodeo 2.8 TDI D/C 4x4
EGT/CHT Gauge, Dual battery system
63 mm freeflow system
DIY built kitchenette / fridge slider
31 X 10.5 X 15 Bridgestone A/T D694 Duelers
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