"Dad grew up on a farm," is among the most frequent opening lines in many American success stories, and that's exactly how Jeff Kelderman begins when telling the tale of the family business he now ...

If you live in Oskaloosa, Iowa—you need a truck. There’s no doubt about that. And if you’re Jeff Kelderman, vice president of Kelderman Manufacturing (makers of the Kelderman Air Ride suspension ...

Kelderman Manufacturing has designed a front four-link air-ride conversion kit for the Ford F-650 and F-750. The company says the easy-to-install system greatly improves ride comfort, decreases shock ...