At the Royal Pacific, the rooms that sleep five have only two queen beds. You can rent a roll-away for $25 a night. Since we drove, we just brought a sleeping bag and foam mat for our youngest son who was our fifth guest.
No problem at check-in and they gave us all five room keys, no extra charge.
Disney wasn't as smooth, the desk clerk at the Animal Kingdom Lodge informed us that they don't allow five in a room - my oops! The supervisor at check-in was willing to overlook it but no room key for our fifth guest so no early entry.
Lou