Let's put a side how absurd the notion of giant tank destroyer being all stealthy is.
It's not really "giant". It has a very low profile ( which is the most important thing for a Tank Destroyer and for ambushes ) and it's only a 25t vehicle so...
Otherwise i agree with the point that the camouflage in the game ( For vehicles or AT guns only ) should only be effective if the unit isn't moving. ( Could traverse tho )
Seriously, when you see a Raketen making his way in the middle of the enemy lines, it's ridiculous. Ok this gun is underperforming and don't need a nerf, but that's not the point.