[MaSnaka]

If you or anybody else for that matter does decide to use the roof structure of your garage for lifting, keep a couple things in mind...They are in most cases engineered or constructed to support a load (roof, snow or floor) from the top, not from the bottom. Hanging weight from the bottom of a truss or rafter tie can be a bad idea. They are not all engineered the same and careful consideration should taken into account. Weight is supported from the ground and the overhead structure is just spreading that weight to the to the outside walls.