The original {{Citation needed}} was in my opinion requesting proof that it was dangerous for the bucket to be reversed on a backhoe, not that is was actually possible.  Most of the paragraph was in fact written as a part of some Vandalism which was not completely removed.  I rewrote the paragraph and provided a photo showing the bucket reversed on a machine, makes sense to me that this should be proof enough. I can provide a cite but it would be from a company who build the hitches, and this might be considered advertising...  Your call.