First every sung Disney I wed bus can hold two
ecv/wheelchairs and their are some that can hold three and a few that can hold four.
So you should aka your self which parks you want more because at board walk inn which I think is the best resort on Disney property you can walk or take a boat to both he and Epcot . You can walk through Epcot and take he monorail to ttc and the. Transfer to the mk line. And coming back take the bus back to board walk because their the first stop.
For cr you can walk to mk and take bus to Dhs and monorail to Epcot and then exit at the international gates and take boat or walk to Dhs. I say the best option would be board walk because you get two park in walk distance but you can't go wrong with cr either so it up to you. If your going to be at mk more the. I go with cr if Epcot or Dhs then board walk inn.
If the bus pulls up and has another guest in a tie down spot you will have two options split up and the driver will call for another bus or have the driver call for another bus then Both wait for the new bus which will be dispatched sooner then Waiting for the next schedule bus so both can ride on the same bus. Most of the driver are great you my and hope you don't get a few bad apples if you do ask to speak to their manager and get their name, bus umber,dot number which will be towards the back by the wheel and time and bus stop and where the bus is going. Hat way just in case you have to wait for the manager and the driver leave you have a way for them to track he driver down. If you need any more info or anything I said cleared up I most of the time may not come out as clearly as I like please feel free to ask and have a great time on your trip. Can't go wrong with board walk inn or cr but I would pick board walk inn but that me you choose he one hat be the best for you.