Interesting thread,
The OP's statement
"Who has run into it, where and what breeds? Looking for a new buddyI like the German Shepherd but have to look at a mix with "they say" lab and american bull dog. More turmoil."
We have been traveling for the last three years with our Border Collie and GSD and have had no refusal for camp space. We have ran into breed restrictions but they are generally for Pitts, Rotties, and sometimes Dobies. Never ran into weight/size restrictions anywhere in our travels. Having said that I will add that we always call ahead and check with the RV parks before arrival just to be sure.
East coast may be different but we have rv'd through CA, NV, OR, ID, MT, and just booked a month through Colorado and Utah for this summer, no problems. Just to clarify, we don't usually book at high end RV Resorts so that may have some connection.
My thought is if you want a GSD than get one but just be fully aware of the breed and of the particular animal before you fall in love and bring it home, guess that could be said for any breed/dog though.
One good thing about the raise in popularity of the Pit Bull over the last few years it has taken the pressure/spotlight off of the GSD :)
Tinbender