Rods handle short runs and soft blockages. Jetters handle fat, silt, scale and roots. Cameras handle diagnosis. A van without all three cannot finish most jobs in one visit.
Sonde location lets the engineer trace the camera head from the surface, so a defect can be pinpointed to within a few centimetres without exploratory digging.
For commercial work, add a larger jetting unit, confined-space equipment and grease trap servicing kit.