You can get cross bars for pretty much any vehicle. If you don’t have cross bars, you can find the right ones by entering your vehicle make and model here. Make sure they are rated to carry the weight of the TentBox model you are buying.
Installing a TentBox is a simple job, but you will require two people to lift it onto your vehicle.
Once on top of your vehicle, the TentBox is clamped directly onto your roof bars at 4 points, using the provided fixing kit.
There are rails that run along the underside of the TentBox which allow the position of the 4 clamps to be adjusted, to match the distance between your roof bars. The pictures and video below show how the clamping system works.