I don't know but I doubt that Twin Air is a folding model. Looks cool though. We live in Portland too but when I was looking there wasn't anything on Craigslist. We bought
our Two'sday off Tandem Classifieds. A couple in Florida had one for sale. We don't use it nearly as much as we thought we would. It folds quickly enough but there is no way to secure the bike in the folded position. It flops everywhere. I'm going to see what can be done with bungees. The ride and handling are very much like a full size bike. In hindsight we should not have bought it even though we paid $1400 for ours. I'd save the money for nice meals on the coast. Take the bus, and when you get there, walk everywhere. My Stoker is blind as well but when she got on this
beach buggy I had to get my own to keep up with her.