Just a couple of words of warning, I was over that way a couple of years ago at a wedding a bit further East by Hof, and the wedding was in village in the old East Germany, things to note, there are virtually NO motorway services there are rest areas with toilets, water and sometimes air for tyres but thats it. Almost all the services are just of the motorway/main A road junctions so you can access the service area from both roads, they are not 24hrs and most of them NOT open on Sundays, or if they are it is very restricted opening hours, local fuel stations also not open on a Sunday and visa/mastercards did not seem to be accepted by the systems, So I you go further east into the old east germany, just be aware sometimes getting fuel can be a problem either late at night or on a Sunday it caught out a couple of people who thought they would fill up in the morning before setting off back home on the Sunday to find that they couldn't!!
The A3 which is the main motorway route to the subject area isn’t short of proper motorway services right through to Nuremberg. I’ve never had a problem getting fuel if I stuck to motorways anywhere in Germany but if you try to go north/south once you’re into what was East Germany it can get problematic due to a lack of motorways for some reason