Look here for the steel tubes:
http://www.lazydazeowners.com/index.php?action=media;sa=album;in=166
The bars are hard to see, partially hidden by the wood framing.
In the photos of the 26.5' MB, on the passenger's side, the three roll bars are located at....
One at the front of the coach's front window, the next at the front of the coach door and the last one located at the front of rear most side window, in the Lounge.
Many times you will find the roll bar's steel gussets protruding into the interior, usually covered with carpet or hidden inside a cabinet.
Larry