Wonderful set of shelving. Purchased two of the 36" shelves through Costco on-line and liked them so much, I bought this 48" model for my garage.
These shelves are very sturdy and easy to assemble. Came with both casters and Feet Levelers. I used the casters for my application. Weight capacity of 160 pounds per shelf (800 pounds per shelf if you use the Feet Levelers!)
I found it extremely useful to use a rubber mallet to "bang" the shelves down to secure into place.
One of the shelf packages arrived with one of the threaded poles damaged such that the top pole could not be screwed into it. Trinity Customer Service immediately arranged to send a replacement pole out. Very easy to deal with.
Make sure you have the shelves spaced correctly as you assemble them, as it is somewhat hard (but not impossible) to reposition the shelves after they are secured in place, as they grip so tightly to the poles using the slip sleeves.
I would purchase again. Lifetime shelves.