Fabulous bikes.. I've owned three. I'll probably get another at some point too.

Engine is bullet proof IF YOU LOOK AFTER IT.. Many don't. It's forgiving but it still needs love. 70-80,000 miles and you really should be rebuilding the top end if you want it to last.

Biggest problem is that good ones are very thin on the ground and the ones with relatively low mileage go for SILLY money.

They are good, but no way worth 3-4K, which is what they can fetch. Crazy for a 10-20 year old bike. You could buy an almost new Tenere for that etc.

They have their failings too. Suspension is basic and too small for the size of the bike. Brakes are pretty poor too for the size as well. Fuel pump needs swapping and the seat is a bit of a pain too. Choke plungers can stick open too although I've never had that problem.

They are BIG bikes so unless you're a skilled rider or a big strong chap, then going off road becomes an issue. You should really consider that. That's always stopped me taking mine on 3rd world trips.. Light bikes are ALWAYS better for a million reasons.

You say "of course aluminium cases".. DON'T !! This bike is heavy enough. Don't turn it into a tank. You will curse it if you ever drop it (and on that trip YOU WILL).

Additional gas tank isn't required. You should easily get 200-250 miles out of the tank if you don't ride like a demon.

Have fun

__________________
Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.