First of all, yes I know this thread is old, but good food never goes out of style, right?
 
R Place is still going & still good, but I heard mention of the Hubcap tenderloin. It’s also still there & still good, but it’s a Polancic’s (as in Polancic’s Meats out of Ottawa Illinois just west down I-80 about 20 miles), not a homemade one. You can go there and buy’em frozen, several packaged together.
 
If you want a TRULY good tenderloin in this area of Illinois, check out Lindey-Gertie’s (also in Morris Illinois). They make their own & while they’re also thin, the flavor of the breading is much better & the cut of pork is more tender. Big as a medium pizza & twice as tasty. They have a special that includes fries a drink & chili with your tenderloin for like $8.