They state the dimensions in the OP: a mile and a half long at altitude, 10 times larger than the Hindenburg, payload of 20,000 tons. No, not 20,000 pounds - tons.
That's the "replace a freighter" model - I was commenting on the parent's "replace a road truck", which seems like a poorer return: since any Zeppelin is going to be inconveniently large may as well go for broke.