I have a 28' x 36' wide garage with (2) 9' wide doors. When I had my car trailer and had it loaded with lumber, I didn't feel like unloading it that evening, but wanted to keep it in out of the weather that night. I had literally 2" on each side to get the trailer backed in. So with that, I would never go narrower than a 10' wide door, or in your case, instead of three 9' doors, I'd go with a 16' and a 9'. That's just a suggestion based on the things I've have to deal with taking things in and out of my garage
No one ever has the "perfect" garage that covers every little problem, but one has to try and think ahead as to what you may be doing in there a few years from now. I've heard some members build with a short ceiling because they will never have a lift, then a few years later have to settle for a mid-rise due to lack of ceiling height. I have one friend that has a lifted Dodge Ram, and when he has used the garage, we've had to stand n the back on the bumper and on the running boards, just to let it slide underneath the 7' height door. So I'd never go less than an 8' x 10' door in the future