Missing Hit Points for Armored Vehicles.
Most Vehicles are only having "HitEngine","HitHull","HitLTrack","HitRTrack" as hitpoints that can be used for Scripting.

RPGS/Anti Tanks Missles or Rounds are able to damage other Hit Points as the named above, such as the fuel tank, making it impossible to prevent a vehicle from exploding, or to trigger the fuel explsion on purpose.

As a result you can not use "getHit"/"setHit" related Script command to influence internal Hit Points of the vehicles {F26466}