I have been looking into touring on a dahon recently. I really like the idea of having a small folding bike to make taking it on planes/trains/buses easier. The speed tr is very expensive here so I was thinking of getting a 2nd hand standard speed or similar and modding it for touring.

I did find this account of someone who used one for a long Europe tour

http://www.foldsoc.co.uk/Mike/dahon_touring.html

One thing I don't understand is you asking about racks. All the info I have seen on the tr shows it to come with front and rear racks. If it doesn't I would have thought it would be easiest to get the dahon racks rather than trying to get standard ones to fit. I wouldn't think the a standard front rack would fit anyway.

They have been producing them for a while now and they are supplied as standard to take front and rear full size panniers. Hence I suspect that they will be fine with a sensible full load. They probably aren't suited for carrying 3 weeks of water across the Sahara though.