My 2002 2720SL had aluminum framing at the lower edge of the walls of the shells. However, that was just about the cutover point - it is at least possible that your TM has wood framing in that location. If so, you should figure out whether any water migrated down the walls to the edge, since wood rot has been reported in this situation.
Take a look at this thread.
http://www.trailmanorowners.com/foru...read.php?t=537
It is not directly relevant to your question, but the first post has a photo showing an easy way to see the aluminum or wood. If you have aluminum, there is obviously no wood rot in this area. If there is wood, you need to dig a bit deeper.
Good luck.
Bill