Why are you planning to overnight? You can be there in 7 hours
Admittedly the BAB7 will begin to annoy you after a bit, but when planning refuelling stops, look for signs on the Autobahn that are white and have a pic of a truck on them and the word "Autohof" just before an ausfahrt. These are modern truckstops, but please do not confuse them with the rip off greasy spoons you get in the UK. The fuel will be cheaper than the pumps on the autobahn, the food will be better and all have male and female showers.
Are you aware of being gassed in your sleep?
Sleeping gas is pumped into caravans/motor homes/truck cabs then the criminals break in and steal your valuables

. Gas alarms are available to detect these gasses, I don’t want to alarm you but I can’t not warn you of what is sweeping Europe, try and park in a busy area and not autobahn parking places.