Shane Tanks were Not as easly destroyed from the Air in BoF as you might think, for the most part they had the same top armor as many of the later war tanks did (thickness wise)and as we all know in AH Strafing tanks dead is well over done and for the most part compleatly unrealistic, and in this time frame as almost compleatly imposable as any other.
Some Panzer II models had 14.5mm top plate.
Panzer 38(t) E & F had 15mm turet top plate
Panzer IIIF Hull top16mm, Turet top 12mm, Superstructure top 17mm.
Panzer IVH Turet top 15mm, Superstructure 12mm, Hull 10mm.
Suma: Hull top 20mm, 28-30mm Turet top.