A tailgate assembly includes, among other things, a frame sub-assembly that includes a driver side section, a passenger side section, and a sill coupling the driver side section to the passenger side section. A door sub-assembly is disposed between the driver side section and the passenger side section. The door sub-assembly and the frame sub-assembly are pivotable together about a first axis between a tailgate closed position and a tailgate open position. The door sub-assembly is pivotable relative to the frame sub-assembly about a first door axis between a door closed position and a door open position. The door sub-assembly is pivotable relative to the frame sub-assembly about a second door axis that is different than the first door axis.