Role of the SPW251/2 Gw?

[hveldenz]

Can someone tell me how the Germans used the SPW251/2 Gw 81mm Mortar halftrack? Was it used as mobile indirect fire mortar platform?
Pluses in the game:
Mobile, good ammo load out, can 'roll' with the front to stay in range.

Minuses in the game:
Expense per gun/tube w.r.t. regular 81mm mortars (multitube units), ? priorty target

Or did the Germans use it as sort of a backrow direct fire sniper:
Pluses:
Smoke fire, reasonable to hits (18-20%) on infantry and ATGs once stable, good range, low priority target compared to tanks in closer or uncovered flakwagens right next door. Good ammo, MG fire also.
Minuses:
Poor accuracy until has been still in a position, single tube, weak kill/damage results by impression.

Comments from the community? What was its historical role? What is it best used as in the game?