Does the bus from Hangzhou to Huangshan scenic area have toilet stops and room for luggage?

Thank for you answer above in relation to this bus - it is extremely helpful. As I have a bad back, I would like to know if there will be any chance to get off the bus and walk around a bit during the four hour trip.We are booked to stay at Beihai Hotel on the mountain and would like to know if we can take our 20kg bags up on the Cable Car and how we get to the hotel from there - do we have to climb stairs or is their assistance available with luggage? Many thanks.