Mueller metal buildings

In my area I'm using econo fab pole buildings and they recommended a 14' eve height. Said with the header it is a true 13' 6" height. The lift dealer here says 4" concrete 3500 psi, and rebar or fiber mesh. Or old livestock fence. I'm going 36x48x14 a 10x10 door and 10x12 door. Going to put my lift far enough back in it won't matter if door is up or down. I saw a 36x36 two bay shop a few days ago and I am glad I went the extra 12'. If you got the room go at least the 30x40, bigger if you can. Just be sure on your local codes. Here the higher the eve, the further off any property lines you have to be.