I was never a auto tech but the good would be you aren't working or getting paid at flat rate. If you will be a field tech you are on your own, all by yourself, no help. You must learn how to do hydraulic repairs. Electric forklifts will be something you will have to learn about. Forklifts can be much greasier than cars. More safety stuff to know about. It is probably half and half with doing maintenance and doing break down repairs. I think most companies will have you work in the shop for a while if the plans are to become a field tech.