The Dempster highway is 750 Km's of chipped slate in each direction. I wore out the tires on my trailer but after including 1500 Km's of the Dempster I have put about 10,000 miles on these and they aren't showing any significant wear or noticeable ride/traction changes. My favourite tire so far. I pull a 27' trailer and a 20' jet boat and camp with a 16' "off-road" trailer in fairly remote locations.How many miles how are they wearing