Best okw counter to on map Howie is Elite armor.
Its not a joke, the panzer commander's artillery costs 120 muni and one shots on map emplacements, it just takes a while to hit. (Not that the Howie can move) pz commander on pz4 can quickly peek into enemy base, drop arty, and run. Will definetly require sweeper support, and use of radio intercept.
I did this sometimes when B4 was in every game.
Noticed that:
-Scatter of the shells is quite high, it's possible that not even one shell hits the artillery piece.
-It's too expensive ( get a panther or now p4, upgrade it with officer, use arty which also costs munitions)
-It's too risky (often enough your tank hits a mine somewhere or gets bumrushed by medium armour)
-The doctrine leaves you vulnerable in early/mid game
It's safer to save 400 munitions and hope that scavenger arty hits.
Stuka works against it but is unreliable, sometimes the stuka destroys it, sometimes decrews and sometimes doesn't hit at all.