My garage is barely big enough to fit our cars but it does have nine foot ceilings. Thus, I purchased some Hyloft 45x60 storage system that connect to the ceiling joists.
Since my home is newer the builder used an "open web" system of joists where it is basically 2x4 lumber on the top and bottom with 2x4 angled supports and braces. Supposedly these engineered systems are stronger and cheaper since you do not have to bore a hole in the traditional 2x12 to accomodate wiring and hvac piping.
However, my initial attempts at research I found a load chart that typically these systems can support 65 lbs per sq ft. But that load is typically 50-10-5 where the 5 represents "low dead load" which just so happens to be where I am attaching the storage systems to the ceiling.
I contacted Hyloft and they indicated that this should not be a problem, but I would prefer to have a 2nd opinion to ensure that I am not going to have things fall on my head including the master bedroom that sits above the garage.
If it helps, the garage is just under 20x20 feet and has no support pole in the middle. Everything is connecting to the side of the house and interior middle on back and left sides.