steved73t,
Try Google..
Kelly
It's south of Tucson near Green Valley. You can drive up to the main building,but you can't see much unless you are in a class there.
Steve
Our local Caterpillar dealer should be able to make an appointment for
you to visit the Caterpillar proving grounds. Good luck.
Lou
Thanks for the info. I need oil filters, so I'll check with the dealer when I get them
Its in Tinaja Hills