With my tongue only half in my cheek I'd say your choice of travelling companion is more important than your choice of bike. Little idiosyncrasies or differences that you (or they) can put up with for an evening in a bar can end up as trip breakers when you're together for weeks on the road. Finding someone of sufficient like mind that conflict doesn't rear up at some point is very rare in my experience. After over 40yrs of bike touring / overlanding etc I only know one person I'd do a trip of over a week with without worrying - and it isn't my wife.

Talking of wives / partners etc, unless they really are of like mind, forcing them to go on a long bike trip is a quick way to the divorce courts (in my opinion (and experience)).

At least with solo trips you don't have to worry that they'll ride off into the distance or stomp off into the night but the up side of sharing the good bits is missing also and sometimes I've felt the trip was hardly worth doing when you can't share it with anyone afterwards. No one to share the problems with can raise your stress levels out of the pleasure zone quite quickly, although much of this does depend on how self reliant you are as a personality. Ted Simon's belief that the breakdowns make the trip may or may not be something that you agree with - although looking back at my touring life it's been the times when things have gone wrong I remember more than the smooth running days. Some of the memories are even good ones!

I'm not familiar with your neck of the US but any bike camping weekends or rallies that you could ride a few hundred miles to might kick things off and you'd meet like minded people. Here in the UK and throughout Europe there are probably hundreds of events like that throughout the year.