JAY-LEN......A lot of the Diplomat's had small night stands next to the pillow area. You could probably remove the night stands and replace the bed platform to a king size. The platform length stays the same.
The downside is that you may not have much space to get into or make the bed.
Our new coach came with a king size bed, (designed for one) but it left little room to get into and was hard on my back to make, trying to reach up from the end of the bed to the head of the bed.