Lots of the touring bikes would work - a shop should be able to work on the wheels to make sure they're properly tightened, and sturdy. That would owrk well, too, given your goal. He may still break spokes - and may eventually need hand built wheels. Most bikes would actually work - I would worry more about the wheels than anything (though there are those who say that even the low spoke wheels work).
Kudos to him for wanting to ride - and what fun!!
CA



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With that being said, I have known Clydesdales and Athenas that ride carbon fiber bikes. The trick to this is getting properly fitted bikes and then splurging on nice, bomb proof rims. A rim with more spokes will work better for the larger rider or a bomb proof rim with fewer spokes. I like the Mavic Ksyrium rim for road bikes and Mavic Crossmax for the mtb because not only are they super sturdy, they are virtually maintenance free. The spokes won't need truing for at least a couple of years.
One gentleman who is 6'4" and 280 lbs rides with the Ksyriums and swears by them.
not that I want/need another bike 
