One of my 1st jobs(many years ago)was at a tire store. I started in the truck shop doing semi and tractor tires...all by hand with beaver tail hammers to break the beads and spoon bars to get them off. Used cages to inflate the split rims. They moved me to the auto shop where I learned on a Coats 40-40 and a bubble balancer. The shop I work in now is equipped with a Hunter Revolution machine and a Road Force balancer. Talk about spoiled.....I won't do tire work on anything else.