Optioned-out vans and SUVs may be all the rage among the rich and famous these days, but there's nothing quite like a stretched sedan for a limousine. A Rolls-Royce or Bentley all the more so. And there's a whole collection of them coming up for auction.

Called the Calumet Collection, it encompasses some 33 vehicles – including Cadillacs, Lincolns, and a smattering of Fords, Chryslers, and such. But the heart of the collection is an array of Rolls-Royces and Bentleys of various vintages. And they've all been consigned to RM Sotheby's for a succession of auctions coming up.

In Scottsdale alone this coming January, there'll be no fewer than 11 of them. There's a 1923 Rolls-Royce Silver Ghost Salamanca, a '52 Silver Wraith, '67 and '72 Phantom Limousines, '87 Camargue hardtop convertible, '89 Silver Spirit Emperor State Landaulet, 2001 Park Ward, and 2012 Phantom EWB "Year of the Dragon" edition. That's to say nothing of the Bentleys that were made alongside them, including a 1947 Mark VI, '91 Turbo RL Empress Coupe, and 2000 Continental SC. And that's just at the one sale. In Hershey, Pennsylvania, next month, RM will auction off Calumet's 1937 Rolls-Royce 25/30.

And at Auburn, Indiana, it sold off the collector's 2003 Bentley Arnage T for $37,400 and '61 Rolls-Royce Silver Cloud for $79,200. That's not even counting the rolling pieces of Americana, like the rare '59 Cadillac Eldorado Brougham by Pininfarina and Edsel Corsair Skycruiser convertible of the same vintage, each of which sold for $82,500 in Auburn. We get the distinct feeling, though, that the classic British luxury automobiles consigned for Arizona will fetch much higher figures.