Ok another pack of suggestions.U may like some of them
SU-122
Produced 1942-1944
Nuber built around 1000 or 1150 as wiki says.
Main gun 122mm howitzer (same type like ISU-152 but weaker)
Can be see on many history records it played an active role.
Maybe can replace some current TD's etc...
BA Armored cars series
There is many of them produced heres some exmples:BA-64 and BA-10
BA-10
BA-64
Produced since 1930's to 1940's
Built in great nubers 3300 of BA-10 and over 9000 examples of BA-64.
Could serve many different roles adding them would be good thing
SU-36
If u think that soviets have poor AA defense this would be good add
But i wasn't able to find much info about it.
All what i know that they are builted on su-76 chasis in small nubers(i don't think that there was more than 100 examples of this)
SU-76
Produced 1942-1945
Nuber built OVER 14,000
Can be seen on almost every EF documentary.
I dont think that there was a battle without SU-76 in it.
Well just another TD but it is a nice looking and could maybe be a russian version of marder III (good gun weak armor)
what u think about those?