All of the responses have good info, but the post above is the most useful to you, IMO, for this topic has been discussed plenty.
Do some research on HU and you'll have a ton of different views to mull over.
Or, if you want to adopt a different approach, research the kind of bikes that were used for big trips from, say, the 1930s to the 1970s; then realise how fortunate we all are today, with anything from a moped upwards. All worries about BMW or Honda will just melt away......
You say you have a Transalp - what's wrong with that bike? Why agonise when you have a bike that'll do the job?
Best wishes and let us know what you did. 
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