Ive been running Spidertrax for about 15k miles now and wheel moderate trails about twice a month so these wheel spacers have seen a lot of different terrain. Fireroads, rocks, boulders, hub deep water crossings and even snow, a lot of snow (2 winter runs through white Mtn). I'd be lying if i said i never think bout them tho, especially on long road trips like the ones we did to UT and AZ. But i do check them according to the manufacturers recommendation on each oil change every 5k miles. Only had 1 slightly loose nut on passenger rear after 10k miles so i removed and reinstalled all 4 corners. I'd recommend Spidertrax anyway!!!