I've loaded a stroller on both. The tram is better, but the bus is possible. On the tram, some seating has larger spaces than others. A couple of weekends ago when we were there, I just loaded the stroller next to us. On the bus last Christmas, we put our stroller in a middle section of the bus (near a second entrance?). I also had the baby carrier/car seat part with the baby next to me. On a school-bus type bus, we put the stroller in the front seat as directed.
This is not a small stroller that we lug around. It was a travel system, but the baby has now outgrown the car seat part. We have always used the SDC transportation, including transportation from Deer Run. Sometimes we look like a crazy circus act, but it's not a big deal to us.