Had them on my Dodge and they were the 1st thing I bought for the SD when I got it. We live in the country and they keep the rocks from pounding the box to death. Only word of warning is if you live where it get into the -30's like I do, put 4 or 5 coats of rubberized undercaoting on them first as they will shatter in the real cold when they get hit with rocks. The rubberized undercoating acts as a cushion. The only issue I had was modifying the mounting brackets for the mud flaps so everything fit. All told took me abt 2 hrs per side.