Trix, what do you both ride now? Are your current bikes not suitable?
If you haven't already, it may be worth asking on HUBB for suggested routes.
Having only hired a bike in Thailand (quite different to your journey) I was happy with a 125cc moped (2-up) for local journeys and hired a 400cc bike for longer distances (still 2-up). Anything bigger than this wasn't required and difficult to find (I believe due to their import regulations).
Do you want to ride off-road? How much off-roading do you want to do?
Thailand has got excellent - mostly tarmac - roads and you would be fine ridng almost anything there. But I'm sure you could find lots of off-road to do too. I would say it's the roads from here to Thailand you need to investigate further.
BTW - I'm 5'2" and have ridden a low-seat F650GS Twin and it was fine but your wife may want to consider a lowered frame version if she prefers her feet flat on the floor.
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Elaine
Striving to live the ordinary life in a non ordinary way
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