They need to have a front-plate due to being classified as tractors. I would find it reasonable to introduce a new requirement for these vehicles (nb: not all tractors) to need a rear plate to make reporting of incidents easier.
That being said, I would find it likely that the local police would already be aware of these hooligans and where to find them.
That being said, I would find it likely that the local police would already be aware of these hooligans and where to find them.