The TowBox Camper is a 330 litre box that is attached to an arm that moves 180 degrees away from the tow ball, leaving plenty of space to open a vertical tailgate or even rear barn doors.
It comes in two sizes with different length arms; the Camper Short (ideal for smaller vans such as the Citroen Berlingo, Fiat Dobolo, Peugeot Partner and Ford Transit Connect) and the Camper Long (ideal for larger vans such as the Volkswagen Transporter, Mercedes Vito and Sprinter, Ford Transit, Vauxhall Vivaro, Peugeot Boxer etc.).
Uebler make a range of tow ball racks that tilts 90 degrees, they are designed to tilt far enough to open a vertical tailgate:
Uebler i21 Z90 tilting and folding eBike rack (2 bikes) no. 18110
Uebler H21 Z90 tilting and folding eBike rack (2 bikes) no. 18170
Uebler i41 S90 tilting and folding bike rack (4 bikes) no. 18140
Uebler H31 S90 tilting and folding eBike rack (3 bikes) no. 18180
You can fit a tow bar box onto these racks: Uebler 300 litre B1 rear cargo box no. 25080