How about a queen?
We went a different route when we had a C-27. We simply bridged the gap between the port and starboard berths with a piece of plywood sitting on two cleats on the berth risers. We cut the plywood into two pieces to aid in storage.This is practical only for a couple with no guests on board since you give up your passageway but, for us, it was worth it to have such a large bed.