Wisconsin recommendation?

We stayed at Plymouth Rock campground almost across the street. Big campground, it was a nice place. I don't think you can get any closer.

www.sunrvresorts.com/resorts/midwest/wisconsin/fond-du-lac-east-koa/?utm_source=google&utm_medium=organic&utm_campaign=yext#
Some friends of ours have a seasonal site here, just starting this year and scouted the whole area. They like it.
JK

Yep - Plymouth is basically across the street. It's a highly seasonal park, and most of the daily sites are towards the back end. If you don't mind being surrounded by a seasonal setting, however, it's a nice park.

Between Allstays & Campground reviews I don't think that anything is missed.

We are at Road America for the IMSA weekend every year and always do a few days prior at Kohler-Andrae State Park near Sheboygan, right on Lake Michigan, and not far from where the track is near Elkhart Lake. One of our favorite State Parks, but the only hook-up offered is 30amp electric. Since most tracks only offer dry camping, having any kind of power is a luxury.