Так и написано же про машинки
Vehicles are not obscured simply for being inside terrain such as woods
or ruins. The 25% rule given above takes precedence.
В РБ жи все понятно написано
Ruins are difficult terrain. Models in ruins receive a 4+ cover save, regardless of whether
or not they are 25% obscured.
Vehicles are not obscured simply for being inside terrain such as woods
or ruins. The 25% rule given above takes precedence.