[villagetinker]

Originally Posted by MandoMan

This isn’t like you, Village Tinker. I’ve read your posts for five years, and I would expect you to see at a glance that you wouldn’t be able to screw a 36” wide unit directly into rafters 16” apart. And normally, you would see a couple easy solutions, such as screwing pieces of 2x4 wood across several rafters and screwing the unit into those, or screwing right angle steel into the rafters and hanging the unit from that. As for the height, you normally know in an instant that you can cut those uprights so they will be the height you want them to be, using your right angle grinder or your Sawzall with a metal cutting blade. This is your kind of project! Not like you at all.

Actually, I did what you suggested, except I had some left-over steel rails that I was able to lag bolt into the rafters, and the hang the storage from these. My post was a warning as others could easily miss some of the details (or lack of) on this item. I was also considering instead of installing in the 3' by 6' orientation using a 2' by 9' orientation, but this presented other problems.
There are several considerations that also need to be considered:
Clearence for people to walk under the storage
Clearence for the hatch on the SUV, especially if backed into the garage
Ability to get to the shelving with cars/golf cart(s) in the garage
Location of existing lighting and the garage door openers.