Hey Jeanette!
Thanks for stopping by the Disney Parks Moms Panel with your question. We're here to help!
Unfortunately,
Disney's Wilderness Lodge does not offer roll away beds, but they do have air mattresses available for approximately $15 per night. If I were you, I would compare the cost of including the air mattress to the room with bunk beds because it may not be a huge price difference. Plus, I'm sure having the bunk beds would be easier and more comfortable anyway.
I'm not sure if you would be interested in changing your resort reservation at this point, but
Disney's Beach Club Resort and
Disney's Yacht Club Resort both offer rooms with two queen-size beds and a day bed. These resorts are typically comparable in price to Wilderness Lodge and just may better suit your family's needs. Plus,
Stormalong Bay is shared by these two resorts and is by far my favorite pool at all of Walt Disney World Resort. It is amazing!
Whatever you decide, I know you'll have an amazing upcoming vacation. Enjoy every second of it and make lots of memories!
~Carrie