Its second largest individual donor is Ann Wyckoff, a granddaughter of the founder of Paccar Inc.

FORBES: Microsoft CEO Ballmer Ups His Ante In Tax Fight With Gates Sr.

Most analysts think investors should stand pat on PACCAR, with nine of 16 analysts rating it hold.

FORBES: Earnings Preview: PACCAR

Besides the companies overtly in this sector, we have a passel of stealth finance companies like Paccar and General Electric.

FORBES: Magazine Article

Key customers include truck and industrial vehicle makers such as PACCAR, Volvo Trucks North America, Daimler Trucks North America, Chrysler and Komatsu.

FORBES: CMI Ready To Rev Higher

Earlier this week, truck manufacturer Paccar ( PCAR) said its customers are choosing to hold onto aging trucks for a longer period of time, rather than replace them.

FORBES: Second-Quarter Earnings Results Aren't Really As Strong As They Appear

The new rules meant that Navistar, as well as rivals like Volvo, Mack, Freightliner, Paccar and Cummins, would have to redesign all their engines for American roads, using technologies that were less than perfect or inventing new ones.

FORBES: Death By Hubris? The Catastrophic Decision That Could Bankrupt A Great American Manufacturer

They include drug-maker Bristol-Myers Squibb (BMY), technology companies Cisco Systems (CSCO-Nasdaq) and Juniper Networks, capital goods firms Honeywell International (HON), First Solar (FSLR-Nasdaq), Masco (MAS), PACCAR (PCAR-Nasdaq), Eaton (ETN) and Emerson Electric (EMR), sneaker maker Nike (NKE), online retailer Priceline.com, energy company Baker Hughes and cosmetics concern Estee Lauder.

FORBES: Sell America, Buy Europe (Selectively)