While they were driving through the countryside they claimed it was only 4 hours to lake Geneva. It's only about 2 hours or less to get to Lake Geneva and you can't blame the traffic because this was said well they were already out in the country.
Once they get to the camp site and the issue of the RV toilet comes up. Mike says "I should have stopped at the Stucky's". There are no remaining Stucky's in either Illinois or Wisconsin. There are one or two in Indiana; but most are located from Kansas to Tennessee and farther south. This is often done to avoid "product placement" or free advertising for a local store.