I "think" at All-Stars all of the Accessible rooms have King Beds. So if you need an accessible room with a roll-in shower and have have 3 or 4 guests, then you "should" be given a connecting room with two doubles.
Yes, you need to speak with the folks in special services. This is an ADA regulation to accomodate your family size in the extra room if the accessible bedding can't accomodate you.
However, legally, in order to accomodate you they can transfer you to Pop Century which does definitely have rooms with roll-in showers and two double beds. But I've never heard of them doing that yet.
Carol