Rock Valley College appears to have a campus in Rockford that has a automotive program.
Can reach out to them, look up the shop contact and email them or call the office, also could find a local coffee shop or gas station hang out near there and look for the tow mirrors, stacks and Cummins stickers and ask some of the locals.
I always found the kids going in the afternoon have AM jobs, but the AM kids might have free time. I worked 3rd shift and went to school 1st shift, so I slept 2nd shift when possible, when I went to tech school.