To all the people saying "why don't they just use normal transports?"
Think about it. If nomads were to properly use materials to construct a variety of things, they wouldn't have human transports to move these materials.
Gallic strong-minded king-lovers (no offense intended, just too tired to think of a way to say it nicer) would not buy an Atlas, simply because they - most probably - think, that their own technology is the best.
And the same thing somewhat applies to AI - at least the Gammu AIs - where they construct their equipment to be of utmost efficiency and use that.
That's my opinion. Let's get some more of said opinions, shall we? 8 )