In my humbleness, I think it makes a difference if the owner just wants the offending vehicle towed away, or to be fined. Gemarah (I think) and Halachah (I suppose too) permits to remove (at violator’s expense) something worgfully blocking you.
הממלא חצר חברו כדים, בעל החצר משבר ויוצא משבר
If it’s going to stay there and the intention is just to get even …. Don’t know.
Likewise if it’s going to stay there and his intention is to teach him a lesson… Good Shailah