I have the Speed Pro by the way - I think the TR is the same bike with some minor changes.
After my experience with the Speed Pro (definitely a fun bike but ....) I'd be extremely wary of a tour of any length on a Dahon Speed TR.
Not quite true - well not at all! The Speed TR was designed for touring with racks, beefy wheels, low gearing, adjustable handlebars. Seems to be reasonably competent given the diddy wheels. The Speed Pro is a much lighter, more racy bit of kit - certainly not a tourer!