Hopefully he don't get clubbed over the head and his bike stolen in some of the places he is visiting. Chicongo, Baltimwhore, Crapton, and a lot of screw york, come to mind.
If he's not in a hurry, then yah, charge at a 115 outlet and spend some time relaxing and visiting. Or if overseas, most of them are running 240 volt mains as their common power, unlike the US with it's split phase. I wonder, they make these little 1 kw portable packs, if you put one on the back, instead of a bag or cargo box, for use in an emergency, a KW at 35 mph should be able to get him close to 10 miles range if he gets stranded. Food for thought there.
Aaron