Some valuable suggestions here, I would particularly point out BTR-60, T-62, BTR-152, AMX-13 and IFA trucks since they are relevant not only to the East Germany map, but for building scenarios on other maps too (Iraq used IFA trucks, Israel and Argentina used AMX-13, Syria and Egypt had T-62s, BTR-60 were everywhere, etc).
I also agree that we should prioritize covering "blind spots" in units, such as:
1. We still don't have SA-4 Krug, used by both Soviets and GDR
2. Cold War era static AAA we have is pretty much limited to ZU-23-2 and S-60. What we can have:
- FK20-2 (Rheinmetall Mk 20 Rh-202 autocannon used in anti-air role; can be static or mounted on Unimog truck; there is also two-barrel variant)
- M167 VADS
- of course, proper L70 Bofors as used by Germany, Sweden, Denmark, Belgium, France, UK and many other countries during the Cold War (this one would probably be the easiest to implement since its similar to the WW2 L60 version we have now)
- ZPU-4 to give some variety to Redfor, once again used all over the world (including potential Vietnam scenarios)
3. Since we don't have a lot Bluefor SAMs, Crotale? We already have HQ-7 which is very similar. In French service, these were used for airfield defense behind the lines, but as we could (potentially) have French airfields, why not? It is also used by the Gulf states (Saudi Arabia, UAE) which makes it relevant for other scenarios as well.