Valley recently introduced what they are calling a Multi-Use Ball Mount, and it allows the user to tow and carry at the same time because it has a 2-inch receiver hitch and a ball mount extension integrated into the same unit.
Yep, now you can carry an accessory like a receiver-mount bike rack or cargo box and pull a trailer at the same time.
The Multi-Use Ball Mount fits 2-inch receivers and measures 10.5 inches in length. The ball mount extension creates a 3.25-inch drop and is rated for loads up to 5,000 pounds. Atop the ball mount is a 2-inch receiver for attaching accessories and it is rated for loads up to 500 pounds.