After months of research and trying to a straight answer on this I feel I need to share this information. I have just fit 255/70/18 Yokohama geolander G015 AT tyres on my np300. This is a 32.06 inch tyre. I have a body lift kit which claims to be a 2 inch lift. The rear spacer is 50mm and the front spacer is 25mm. This raises the rear 50mm, and front only 30mm. The lift kit cost £120. I hope this helps anyone out there!