i would love to see more variety in vehicles especially tied into rank. US has a pretty good advantage in lower end vehicles right now. Humvee's are easy to drive and hold max of 300 supply in the covered version, while they do chug gas that is hardly a concern to most use cases or to those who can source it. Soviets don't really have an equivalent and are stuck with using the UAZ/UAZ-452 Ambulance for everything short of truck sized actions. Even getting a simple Reskin of the UAZ-452 or as it's affectionately known as "Bukhanka" into a general transport variation would be great. They are used for just about everything.
Not to undercut PR9INICHEK's request as i would love to see A Shishiga as well.