There are two things to remember when arriving in France and heading east through Belgium.
Services on Belgium highways do not have ATM machines.
All the restrooms require €0.70 to use.
At least there are plenty of trees. To make it worse I have a large pot of Euro cents sitting next to my TV. I got the 6:00pm ferry from Dover to Dunkirk and after a 2 hour crossing, hit the highway for Garmisch. It was after 12:00 when I stopped in a rest area for a sleep, and was away early this morning. Garmisch is about 5 hours away so I should easily make that for this evening.
Still haven’t found an ATM, but at least there are McDonalds here.