Yes the stock rear blocks were removed and the 2" blocks from RC went in. I trailer all the time a duck boat and a Ranger fishing boat. My Ranger is a multispecies rig weighing around 5,000lbs and causes the rear to sag. It still tows fine, but you can tell you are riding high in the front. I put in Air Lift 5000 series air bags and run them at 20psi, levels everything out and tows great.