The DT is still available here (SA, along with the 175) and you see some of them around. As long as you don't thrash the little thing to pieces or load it like a mule you will be fine. Obviously you will take some more time to travel as compared to a R1100 / 1200.
My advice: Take a 10 l jerrycan with you. You can buy them at most car & 4x4 accessory shops. Don't go for a 20l one as it's too heavy and you won't need that much additional fuel.
There is little an old two stroke won't make. Lots of them run as farm bikes here.
Two strokes don't tend to have problems with fuel quality.
Have fun!
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