Having done trips on a Triumph Bonneville that "people" tell me are only possible on an dual purpose type bike I'd say take the Harley. Only thing I'd suggest is look for tyres that won't block up with anything loose, so a block/catspaw tread rather than semi-slicks. Far better to have a bike you are comfortable with mechanically and on 90% of surfaces than start planning for the what if's.
Enjoy your trip,
Andy
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