find a camp spot that allows my German Shepherd?

I don't know if they will or won't allow a GSD, but you may want to check with DogFriendly.com, to see what they offer for campgrounds.
As mentioned some places just have rules that they follow based on their own insurance. There is a super dog friendly CG here in NC (opposite side of the country) at FourPaws Kingdom CG. I would think that there are some others around the country.

As suggested, you might do better at National & State CGs, since they work by different rules.

Good luck.