Great technique, and thanks for sharing! We usually go for the roof right away for better patient access, then make a wedge cut at the angle of the A post and the running board, and use a hydraulic ram to push off the bottom B post/running board to the dash-level angle on the A post. almost as fast for us (though we have the capability to run 2 spreaders and 2 cutters simultaneously if we have both Rescues on scene). Definitely a good one to keep in the back of the mind though!