Unimog Club UK

As I understand it the transport of logs etc is dependant on what stage they are in, for example if you are hauling logs or rounds to split at home, then that is part of the arbourist/agricultural process and allowed to use red, but if the logs are split, ie in the finished state then it becomes haulage and requires white.
This was the view of a customs officer I asked about it, though it was his view and cannot be relied on as the definitive answer.