Cantilever is the right design when a standard double-post carport does not fit your site. Common situations include a narrow driveway where a second post row would block turning space, parking alongside a boundary wall where you cannot place posts beyond the property line, and commercial bays where maximum vehicle width clearance is critical for delivery trucks, minibuses, or large SUVs.
It is also the preferred choice for corner sites where vehicles need to turn sharply on approach, and for properties where the aesthetic of posts only on one side suits the design of the home or building. Cantilever frames are engineered with heavier base footings to compensate for single-side loading, the structural integrity is equivalent to a standard double-post carport.