What does 2 Samuel 6:3 mean?

They put the Ark of God on a new cart and brought it out of Abinadab's house. Uzzah and Ahio, Abinadab's sons, were guiding the cart. 2 Samuel 6:3 - Modern Text Bible

(They use a new cart, probably out of respect, and Abinadab's sons are in charge of moving the Ark.)