Do they really have showers here at this test area, and how much does it cost?

No showers at this place

Minnesota rest stops do not have showers. There are truckstops that do but do not know any specifics.

I also don't recall showers. However, there was a T&A truck stop with showers down the road when I went through.

I don't remember there being any showers - just bathrooms, a few vending machines and maps of the area.