i ran milemarkers for 3 years before i broke the first one, if its just a daily driver and you only use 4wd for highway use in the snow and mild off highway use with stock tires they should hold up good enough. i broke one of mine while backing into a parking spot that had snow shoved into it with a blade. i thought id just back the truck on into the pile, put it in 4L and started backing up, as the rear started pushing snow the back tires were on snow and not gripping much of anything. the front wheels were on clean, dry pavement and doing all the work. i broke the drivers side internal lock ring in 3 places. at least it was a hub and not a stub shaft, u-joint or the spiders in the differential. a hub is the easiest and quickest "fuse" to replace. not the cheapest, but since i had to get a new set of hubs, ive now got a spare. and the knowledge to not use the back of my truck like a bulldozer when only the front tires have good traction.