Building a RV garage input needed. Pictures helpful

I (THINK) there is a minimum clearance door hardware that you can get for maximum height to sidewall clearance. Yes, they are more expensive but if you consider the extra expense to raise the walls to accommodate the standard door hardware, maybe it's cheaper ?? I don't think the door, the part of the garage you use most, is the place to cut corners. If you have all the space in the garage but have to juggle around an opening to use it, it could get agitating ...... IMO...