Dear Don.
SU-122 - It is necessary to clean from game since after WW2 they any more were not on arms. After WW2 on arms were in the mid-fifties made SU-122-54 by small party 77-95 units.
link:
http://forum.shrapnelgames.com/showt...hlight=russian
Here we already discussed on this theme.
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As to use SU-122 as SP Howitzer is a truth. They were used as artillery and as assault gun.
http://ru.wikipedia.org/wiki/%D0%A1%D0%A3-122
Here a translation into English of the first paragraph:
"SU-122 is average on weight the Soviet samohodno-artillery installation (SPG), belonging to the class of assault guns (with some restrictions it could be used and as a self-propelled howitzer). For the first time have been applied on February, 14th, 1943 in region Smerdyni as a part of 1433 and 1434 SAP in private operation 54A on the Volkhov front."
Best regards