If no luck otherwise Rich, tough cases like this sometimes necessitate trying to contact family members of business owners who've passed away but often surprising how well a quick phone call is received also info etc happily offered!.
If you haven't seen them already, here below are links to the 2006 obits of Leonard 'Chick' Hendricks, former owner of Hendricks Bros. Auto Sales..
Note his immediate family is listed including names of sons complete w/ wives names and towns where they live also his brothers names, one obviously part of the business and a link to possible further leads?.
Also noteworthy, Chick was a WW2 Vet!.
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Good luck!.
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~ Pete
http://wyscaverandmore.us/nti/nti00140.html
http://www.findagrave.com/cgi-bin/fg...;GRid=13494786