I'm a massive fan of rotopax style fuel containers, a lot of the guys in our 4wd club use them for extended touring, as they sit a lot lower to the roof rack/platform than J cans...
http://s.aliexpress.com/nQjyeMJB?fromSns=Copy to clipboard
They come in a lot of different volumes as well, so you can have say 2x 30l diesel containers and a 5l 2- stroke one for the chainsaw
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