I saw a picture of a house for sale with a fairly new stand alone garage. Looked to be a 4 in 12 roof, 2 car garage with a standard looking ridge down the middle. The inside showed it had a very deep ridge board and no cross ties of any kind. It was rafters and not trusses.
I have never seen this type of construction but I read it is not uncommon. You could even hang a light duty crane trolley under the ridge beam.
Of course you have no attic storage.
Bill D.