Those shelves seem to be for canned goods only -- very limiting. You could use one narrow unit with other kinds of shelving, depending on the size of your pantry.

We have adjustable wood shelving with built-in supports, the kind that uses pins inserted into predrilled holes that the shelves rest upon. I have already changed the shelf positions as I organize the pantry, and I can get more shelves in for maximum storage. "Wire" systems like Elfa will also provide this kind of flexibility.

Why not consider something like Metro Shelving (or one of the many other brands of similar shelving). This is the heavy wire shelving used in many commercial kitchens. It's available in numerous sizes, many different finishes, you can configure the shelves to suit your needs, there are tons of optional specialty storage accessories available, and it'll save you a bundle over the cost of custom shelving built-ins.

I initially put Metro in my walk-in pantry as a temporary solution until I figured out what I really wanted. I liked it so well, I kept it and just modified some of the configuration and added some accessories. I keep groups of things that I'm likely to use at the same time in pull-out plastic baskets. Baking supplies, for instance, are kept in one basket that I just lift out and bring to my work area when I'm baking. The same for other similar groups of items. Works great.

If you have one of those "storage container" stores or a restaurant supply store in your area, they usually have a good selection of sizes and accessories. If you don't like the wire shelves, you can get clear plastic liners that fit on top of each shelf, giving you a nice smooth surface.

Also, if you shop around on line, you can often save even more. Quite a few places discount quite heavily.

Here is a link that might be useful: Metro Shelving

I just saw the can holders like your "rolling pantry shelves" on a much small scale at Costco. It was made for about 40 cans and meant to be put on a shelf (not rolling).

Think about what you want to put into your pantry. I have 7 children so I do alot of bulk buying. My walk-in will have shelfs big enough to hold large packages from Sam's (toilet paper, paper towels, cereal,etc). My husband wants me to make a list of items that I buy but find it hard to store when I get home.

We did Elfa shelving from the Container Store. You go in with your pantry dimensions, and they design it and cut the pieces for you, and you install it yourself. My dh did it in an hour - it's just a matter of screwing a piece to the studs and building from there.

Can you tell us what size room you have?

The thread linked below discussed wood shelves vs wire shelves (including the Elfa ones mentioned here). Check out the thread for ideas and pictures!

Here is a link that might be useful: Walk-in pantry: Wood shelves or wire shelves?

I would put in wood shelving and then perhaps purchase a couple of the rolling storage units that sit on a shelf for your canned goods.

Gravity-Feed Can Rack

Not as neat as your link...but more useful for only a few cans as opposed to those racks that must hold hundreds!

Here is a link that might be useful: Anyone willing to share the inside of their pantry?

Wire shelving is great for a walk-in pantry. I outfitted our 8' x 10' pantry with wire shelves from Superior Shelving. They carry both the Metro and Nexel brands, with Nexel being about 20% less expensive. That saved us about $360.00.

We also added slanted shelves, a butcher block work counter, wire wine bottle shelving units, and a wall grid system for a complete kitchen system. Plus, we hung a 30" x 60" wire shelf from the ceiling with some chrome plated chain, and then hung our pots and pans around the perimeter of it.

Here is a link that might be useful: Superior Shelving - Nexel Wire Shelves