I bought the extension rack to hold lighter gear cases which would fall out between straps on the main Rock N' Roller load. It actually worked a treat and they stayed securely on the rack away from the speakers and other cases. My problem occurred when it came to fold down the Rock N' Roller... The handle bars (which normally fold securely in place) were blocked by the rack and the whole unit was too big to place in my van with the extension rack adding height to the whole unit. So I had to assemble and remove it every time.... Which took a bit of work.
A suggestion to the manufacturer.... Instead of the side-fix assembly... A simple cantilevered system (using the load weight to hold it in place) would be as secure but much quicker to clip on and off.
Otherwise... If you really need the extra load space and don't mind the stow-away size. I would recommend it.
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