The single tray allows you to add one handle to steady your Lenzo housing. The double tray allows you to add a handle on each side for greater stabilization.
There is also a new ball adapter that goes in the middle of the housing BA-AQNL, this will allow you to put a light directly on the top of the housing.
Ultralight Control Systems
Booth #741
www.ulcs.com/index.php/products/accessories