I love to shop to Walmart I wonder if it is the largest corporation.
It depends on how you measure the size of a corporation. I believe that Apple is worth the most money amongst corporations.
But it must be in the top 10, I can't imagine a bigger grocery retailer. 
Yeah it's quite big. I like going to Walmart to people watch.
Walmart
Walmart Inc. (; formerly Wal-Mart Stores, Inc.) is an American multinational retail corporation that operates a chain of hypermarkets, discount department stores, and grocery stores, headquartered in Bentonville, Arkansas. The company was founded by Sam Walton in 1962 and incorporated on October 31, 1969. It also owns and operates Sam's Club retail warehouses. Walmart has 11,368 stores and clubs in 27countries, operating under 55 differentnames. The company operates under the name Walmart in the United States and Canada, as Walmart de México
GURPS Vehicles" is admirably flexible and enables you to design pretty much anything you like" however he concluded: "you can't help but wonder just how this book's going to be useful. Certainly, if you're running a vehicle-heavy campaign, and want some degree of consistency in the designs, or intend to allow your players to build custom vehicles, then "GURPS Vehicles 2nd Edition" will be very handy indeed. For most campaigns, though, I can't imagine it's going to be required