[theCADguy]

Since under 3.1.2.3, totes can't be higher than the backstop, the bottom of the bin cannot possibly be above level 6. However, it would only be logical to mark a level 6 if and only if the bin can be scored at that level (since levels only apply to the bin), but this requires the top of the bin to be above the top of the backstop. So therefore, we should be able to legally stack 5 totes and a bin, but I would Q/A it to be completely sure.