I've done Thai, Cambo & Laos on bikes rented & registered in Thailand, BUT the owner of the bikes was always travelling with me. He said it could be tough on your own, even if you had an authorisation letter (although that did work for me in southern Africa a long time ago). The trips in Asia were 6-7 years ago, too, so things could have changed, but English probably still isn't widely spoken at the borders. Oh yeah, and as already said, Vietnam on a foreign bike is a big problem.
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