Hi Dunkmuddie
Recently had a long chat with my local tyre guy as I'm coming up for a new set of boots, he's pretty well respected in the area for his knowledge and advice and belongs to an advisory motoring group who seek advise from him in a professional advisory manner. Anyway, scrubbing on the front is normally due to the lack of Toe-in and Toe-out on the Navara, set dead straight from production. He also advised that he had seen a few with too much camber adjustement (that's what mine has got) but more importantly he advised that it is imperative that the wheels are rotated every 10k to spread the wear caused by having a no Toe setting, so much so that he provides an FOC service to do this and has said that he will stake the cost of a new set of tyres if I don't get at least another 15K's out of the new set providing i have them rotated when necessary!!