Don't quote me on this one Ian, but before I was 'aware' I wanted to take my Duke II on an overland journey - Bracken (London Garage http://www.bracken.co.uk)
I believe said that, amongst others, you could not enlarge the tank (standard 11 or 13 ltrs???) - and I believe the duke tank is the same as the Enduro.
I agree - The Adventurer is not what I would call an 'Off-Road' bike - please don't misunderstand - but the reason it's great for desert & dirt roads is the long wheelbase (and weight to some extent). For tight corners - the power & wheelbase make it less responsive but possibly too powerful for turns etc... But for general overlanding - dirt or tarmac roads - it's great...
The other choice it to get up on those pegs and just tank it... Gung Ho and over the top and all that...
KTM LC4 640 Adventure-R 2001
KTM Duke II 2000
Kawazaki ZX-6R 1998
BMW F650 1996