Hellwig EZ- Medium Duty Rear Helper Springs are a set of secondary leaf springs that are made to work with OEM leaf springs and provides support for extra loads. Hellwig EC- Medium Duty Rear Helper Springs are perfect for small trucks and SUVs. They prevent leaf spring from sagging due to sustained load compression. Their load carrying capacity is up to 500lbs. They easily restore proper ride height when towing a boat or small trailer, keeping your ride steady and comfortable. Hellwig EZ- Medium Duty Rear Helper Springsdecrease leaf spring wrap-up, bottoming out, and loss of cornering traction.