If you are building and serious about adding a hoist, then if your garage roof uses a standard truss design between the ceiling and roof it could be changed to a cathedral type design with larger (deeper) rafters and a collar tie at half height which gives greater internal space but no change to the external height.
It opens up all the wasted space that standard pre-fabricated roof trusses create.
This could easily give you an extra 300-400mm above the car footprint.

