It's been over a decade since I last operated an excavator, so grains of salt as usual - but I'd say it should be manual, or at least semi-automated. You need to take care where you unload the bucket on a truck, to avoid its weight distribution being off-center, or to keep various kinds of soil separated on the bed (e.g. we'd load the front with topsoil and fill the rear with the gravel or whatever else was below.