An Octavia no. I have 6 vehicles at the present moment in time. I hope that your labels have the effects that you desire, I would be surprised if they are taken notice of however but let us hope so for you guys. Do Octavias have particularly bendy sills?

Trolley Jack:

Forklift :o

Myself, I'd not rely on the sticker to stop them jacking the sill, I'd rather have stickers on the locations TO jack from. Then stand over them and say look for the sticker for a safe location.