Thanks for all the replies. I have an REI close by so I can "buy" a burley travoy and if it doesn't fit, I can return it within 30 days for a full refund. I'll give that a shot, and use my standard bike on the bus, which rarely has a full rack.

Rhm and fietsbob, thanks for your suggestions, too! I think it would be a great, eventual, project to design a trailer, where the frame would basically be an air-travel case with wheels, such as the baby stroller's attached. I could use a gig bag then to put inside the travel case and it'll be nice and insulated and cushioned from shock.

Do you think the burley travoy could fit inside a backpack or messenger bag? Not necessary but I already am carrying a lot of stuff