I need a larger backhoe bucket.

Until recently, my home was set up on a septic system. Lines from the bathrooms, kitchen, and laundry room ran into a septic tank, which had to be pumped out every now and again, as needed. Then, we received word that sewage was coming to our area. The main lines were installed, and each homeowner was responsible for hooking into the main line. In order to do this, the lines in the house had to be re-routed, then the lines had to be run out to the main line. I rented a backhoe to dig up the front yard, but I ran into some problems. In order to dig deep enough, underground rockks had to be moved. The rocks were far too large for the backhoe bucket to lift and carry. I need a larger backhoe bucket, with more capacity than the current bucket, to be able to lioft and transport the rocks.