...i would rather the Stuka be changed to work as a mortar HT with barrage only (flame kind) for the mid game and the HE shells be unlocked once the T3 is setup and some level of teching been unlocked. Then you could just upgrade the Stuka for a similar total cost as other rocket artillery.
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I did not make suggestion on the units so I can keep on trucks, but I had a similar suggestion about the Stuka.
One could even try other thing like mortar half truck in truck ,2 stuka at truck 3 and ober at Hq.
But this has more do to do with balance and less with tracks designs.
My point here since OKW have less and less reason for aggressive track placement one should make it a choice for the player either to invest more and go for aggressive placement or spent less and use them as regular buildings.
One could even make some of these upgrades (like FRP/engineers/AA gun) cost more but also increase HP/armor of the track.