Left out of the discussions above is the critical role that the cyclic control power has in eliminating/preventing dynamic roll-over. The old helo operating guidelines (and the training manuals) were written when the teetering rotor was common, and when thrust control was the only real control the cyclic generated. This is also true of the low offset controls of the Super Puma family.
More modern control systems produce (literally) tons of roll control at flat pitch, and so make it much more rare that a dynamic rollover condition could be reached. This involves the flapping hinge offset of the rotor, and its ability to produce head moment regardless of the thrust the rotor is producing.
Of course, the vertical cg and the landing gear spread are also contributers, but I believe it is quite rare to experience roll-over in most Boelkows, and in the Black Hawk, for example.