I would go for the StuG as first choice, especially when it has the side skirts on it and the top mounted MG.

As for the SPA, I would have to go with the M7 priest as well

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They shall grow not old as we that are left grow old Age shall not weary them, nor the years condemn
At the going down of the sun and in the morning
We shall remember them. Lest We Forget