Ah you did not mention that you booked a TPV room. Yes 4839 is also a King Bed room. Normally if a DIS member does not indicate that they booked a TPV that means a Resort view.According to Touring Plans, 4839 is also a King bed room and our reservation is for Atrium Club, Theme Park View. I made the request with DSS when they called at 60 days out.
I would suggest you also call reservations and have the CM note your 2 requests: 1), King Room, 2). Near Elevator.
Wait a day and then call DSS and ask the CM to verify your requests on your reservation. You will have a 1 in 22 chance of getting 4839 and about a 8 in 22 chance of getting a room near the elevators. DSS is available at 407-939-7777 seven days a week from 9 to 5 ET.
It really does not matter if you do on-line check-in or not you will have already been assigned a room about 5-7 days before your arrival. If you go with an on-line check-in just make sure that you don't make any requests as they will overwrite your requests already on your reservation.Is there any reason to NOT do the Direct-To-Room pre-arrival check-in?
What may help is if you arrive at the CR earlier in the day. How soon do you plan to arrive at WDW? If you don't get a text or see your room number is 4839 in MDE then you would want to check with the Concierge CM to see if 4839 is available.
Dave