Wherever and whenever you need quick storage shelves, a portable shelving unit with wheels is your best bet. Some models are made to hold up to 75 pounds with wheels installed, and they can be quickly set up in the garage, basement, laundry room or wherever you need quick storage. If you eventually want to place the shelving unit in a more permanent location, you can simply remove the wheels which will allow for heavier items to be placed on the shelves.
Portable shelving unit with wheels:
Portable shelving unit with wheels pictured: Origami R5-01W General Purpose 4-Shelf Steel Collapsable Storage Rack with Wheels, Large
Of course, the advantage of any piece of furniture that has wheels is the fact that it can be moved easily.