2,000 miles in seven days is a lot of driving. Don't forget the time spent parking, getting gas, rest stops, etc.. 300 miles per day is at least 4-5 hour in the car per day.
I noticed the stop in Nuremburg. My wife and I spent a few days there (unplanned - long story!). It has a great center city, the deep well at the Imperial Palace is cool, and it has some relatively interesting sights. However, I think the city center of Munich is just as good with a similar experience. Although I did not visit any of the WWII sites at Nuremburg, you could visit the Documentation center at Berchtesgaden which will have similar exhibits. Cutting off the trip back over to Nuremburg would save some time/miles.