can anyone advise a safe way to carry extra fuel/petrol on the bike for long trips the tank has 16litres I believe with a distance of 300 kilometres; how to got more by carrying fuel/petrol
OP is from Australia - it's more of a necessity than a choice for him. Those Rotopax look pretty sweet, watch out if you mount them vertically though, appears that the mounting hardware wasn't built for that and you'll need to beef it up a bit.
Here's what it looks like mounting one of those MSR Fuel bottles. Caladin had two, mounted to each side of the bike. You can read more about here on his thread.