The Van Mark Wheel Kit is designed to make moving your brake around the job site easier for you. By attaching the wheel kit to one side of your Van Mark brake, you will be able to pick up the other side and easily pull or push it around from job to job, which will be more effective than just carrying it. This wheel kit also works for rolling off the back of a trailer or truck and onto the stand at the job site. The main difference between the two wheel kits is part # 3035 has a longer axle for a wider throat depth brake.