First of all, like others said, take the bike you prefer. And then maybe choose the roads for it . I like guzzis a lot but I wont go RTW with for mechanical problems reasons ( serious and documented ones you may find on fora of aficions here in France and Italy  )
A honda will do this job for sure , a bmw also ( an old one not sure for the "water" 1250) or wahtever , a SV, DL ...
90 % and 10 % well well , some 1% could be impossible to cross withe these heavy "trailies" .  i can give examples .
And there are some other occasions, except if you are really trained or/and very strong , like going on a little boat, pussing the bike up after falling 10 times and so on .
anyway wait for the tests .
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