You got it a bit wrong. These are not made for "real forestry", we do something called gallring (in Enhlish thinning?). That is done many years before any logging (usually done with processors) and means taking out trees under ~10". Yes, one can use these for work but I think that the majority are used for recreational forestwork. I guess that it is possible to move dirt with a Tesla but a Caterpillar does it better. You can take the Caterpillar to the store but the Tesla is better. These machines are not made for +20" logs in the Rocky mountains, there are other machines for that. For these I would say 10-15", 10-12 feet long? You know: it's not the size, it is how you use it 😉🤣.