Seasail,
I have done the wheelchair thing from Galveston with rhapsody for my husband. Call RCCL before you go and tell them your booking number and ship. Let them know you will need a wheelchair for embarking and disembarking only. They will have a wheelchair waiting for you when you get there. A staff member will stay with you the whole time and take care of your husband. They will take you directly to your room. You won't have to wait at all was my experience. I am doing it for my dad when we go to Alaska. This all no charge unless you need to rent a wheelchair for the whole trip. RCCL is awesome!!! Have a great trip.......