We took our Sit n Stand last spring, and while I can't offer you help with the busses (we drove), I can tell you that you can drive the stroller unfolded onto the monorail. If you have to get on any trams with the stroller, keep as much stuff out of the undercarriage as you can handle and prefold up the stroller before you get on. It will save a TON of time.
Will you have assistance with you on your trip? If so, have one of you hold tight onto the kids in the queue and the other fold up the stroller. It may have a single-hand release to fold up.
Good luck!