I started researching hollowing systems because I can see how they would make bowl turning easier on my back, neck and shoulders. And probably less white knuckles too. Depth need beyond 10 inches is doubtful. And let me state emphatically I am not interested in fabricating a system.
There appear to be several systems out there with Carter @nd Oneway being the name brand manufacturers. My first criteria was to use some sort of a captured system: roller/slider bar style or an articulating arm system.(Major size/storage difference) Are the articulating arm systems strong enough to withstand a major catch without bending something? The Harrison system is relatively inexpensive, but does not appear very robust. Anyone have experience with it or other articulating systems ie Elbo?
The slider systems appear to be made for deep hollowing and weight lifting! But mass does have advantages.
So I value any information that you can share about commercial systems and your experiences.