Just looked at the photos in the link. The rear bed is clearly the original queen - it is not expanded at all, and there is no way to increase the width or the length. (I have owned three 2720s). The front bed appears to be original as well, so it is probably a double bed size, not even a queen. Incidentlly, TM lists the sleeping size for this model as 4, not 6.
This is a 2720QD model. Check the TM web site
www.trailmanor.com for details.
If you are seriously interested, I would ask him to measure the mattresses on the beds, both width and length.
Bill