I installed these spacers on my truck last night. They look great. They are hub centric which gives me some piece of mind. I have not notice any vibrations.The 1.5" spacers will get your stock Ram wheels flush with the fender flares. Ram should've offer wheel with more offset, so we wouldn't need to buy these.The install could be tricky for some folks without the right tools. I have really nice Snap-On torque wrenches, so it was easy for me. What you want to do is make sure the mounting surface is as clean as you can get them. Then torque the spacers to 125 and the wheels to 120, going up from 50, 75, 100, 110, then the final torque in a star pattern. Don't use the included red lock tight, else you're going to have a hard time removing the lugs. Blue is good enough.