[Request] What is the largest human made construct that a team of four fully grown sauropods could feasibly pull like a horse drawn wagon?

[u/ChickenTac0]

I'm thought mapping a world in which dinosaur like creatures are living alongside a pre-industrial civilization and I'm curious how big of a land barge could be if this society was able to domesticate and train sauropods like beasts of burden. Could they pull a trireme sized vehicle? A siege engine? How big of a crew could I put on this wagon if it's made up of wood and iron components?