Mine is a long overhang, and has 6 fixed attachment points, so could accept 2 or 3 bars on the roof. As I said, they're fixed, so the bars cannot be moved front and back. As a consequence the big roof box I have cannot be used without some retrofitting or drilling new holes into it, but I will likely not need it since the space inside the van is huge. So, big roof box is for sale. Cheers.