If there is no Animal Companion ability to assist in control, even a Transcendent Druid can at most calm those ferocious beasts, preventing them from launching an attack on their own. It's impossible to make them pull a cart.
This has been verified by countless powerful Druids.
As for Magical Beasts whose body type can reach colossal size, none of them are below Transcendent level. They usually possess intelligence comparable to sentient beings. To make them pull a cart like livestock is unthinkable unless they are willing.
"It seems I have oversimplified this matter," Gaven thought for a moment and said, "Then we should adopt a dual approach. I have a batch of Charm Bracelets that can charm and control around two hundred colossal ferocious beasts and Magical Beasts for the long term.
I will also transport eight hundred gigantic livestock from the Battle Valley as quickly as possible."
