320mm rocket carrying pioneers

[BigDuke66]

Aren't there plenty of pioneer units in the OOB that use already some form of demolition charge?

Here some pictures that show how these rockets were fired from the ground:
http://upload.wikimedia.org/wikipedia/co...insatz.jpg
http://upload.wikimedia.org/wikipedia/co...insatz.jpg
http://upload.wikimedia.org/wikipedia/co...insatz.jpg
http://upload.wikimedia.org/wikipedia/co...insatz.jpg
http://upload.wikimedia.org/wikipedia/co...insatz.jpg
http://upload.wikimedia.org/wikipedia/co...insatz.jpg

I can imaging how single rockets were fired in a hurry by Pioneers directly from the "Packkiste" the box with which it was delivered, it's said that this has happened several times in Stalingrad at ranges from 120 to 300 meters to stop Russian advances.

Another source mentions the these rockets were later given to the Infanterie and Pionier units because it took too long to make all the launchers(either the "schwere Wurfgerät 40" made out of wood or the "schwere Wurfgerät 41" made out of steel) of a unit ready for fire and so they were unsuitable for assaults.
The 15 cm Nebelwerfer 41 was much better suited for this:
http://en.wikipedia.org/wiki/15_cm_Nebelwerfer_41