Hi any one out there help me with this one? I've just purchased a nissan X-trail and had a tow bar fitted. I felt the tow ball loked a bit high so I measured it at 480mm from centre of ball to floor, all the info I can find states the figure should be between 350 amd 420mm. the car has about half a tank of fuel. any other x-trail tuggers out there with a similar tow ball height. it's a witter tow bar. Ian.