At the USAC finals a couple years ago I seen a very clever install in one of the many demo booths. Guy was using air cylinders for motorization, it was so smooth, no jerking or bouncing of any sort. And it was completely noise free, no whining of the motor lifting the amp rack. Before a show he stops at the gas station to fill the tank with air, said it lasts all day. I didn't get into details of what he used, figured somebody on here might have seen it or actually installed a system close to this. Was gonna go with the linear actuators from Select products <bit pricey though> but after seeing these doors slide so smooth I was sold on the idea. I just hope it's not to difficult to incorporate in the system. Any ideas on how the system could be set up?