Twin over king bunk bed. When you need an option that is ideal for your childs room our selection of twin over full bunk beds is a great choice. How to convert the simple beds into a twin over full bunk. Twin over full bunk beds with ladders or stairs. Twin over twin stairway bunk bed converts to 2 single beds but the top bunk foot board will have the gap that is the entryway for the stairway.