I'd look into the MJ opener it's a jack shaft opener and built to handle a door of your size. Yes a residential jack shafts should be able to open the door, but at the size door you mentioned, that is not a "residential sized door" the medium duty jack shaft is actually produced for a door in this general size and weight range. As far as the whole door being too heavy argument, it is a valid point no matter what anyone may think. Yes the springs are suppose to balance the door. But a heavy door is a heavy door no matter what. Who is to say the door is balanced properly? Not every door is and would you rather spend 500 bucks on a residential jack shaft and have it break in a year or two, or get a medium duty and know that it will work for years to come. The residential jack shafts are driven by plastic gears and thin chains. The medium duty is all metal with thick gears and bicycle chain. Just my two cents as a commercial garage door tech for over 12 years.