I would ask Johnr J for his insight on your issues. From discussions on this website I can tell you he has a lot of experience in this area. The type of lifts, hour usage, and the operators training and attitude all come into play. If this a new operation you have the chance to build up a top notch operation from the ground up. Just remember when hiring operators these people can make the difference between a smooth running operation and a total nightmare. Attitude is everything!