FYI, I have been an owner in an RV resort in Dahlonega, GA for 8 years. Most bigger parks have "ownership" implications and nearly impossible to book for 30 units or more. Really tight around Helen. BTW, been going to Helen for many years, like 20+. It has evolved into a money pit for tourists. Few nicer restaurants featuring German fare have survived.
I would look at Pine Mountain. Been there. Nice place; lots of room. Many interesting things in the area; ie, Calloway Gardens and Warm Springs. The latter was Roosevelt's summer white house and it is a museum today. The grounds are beautifully maintained and a must see. President Roosevelt actually passed away while there. His actual furniture is still maintained in his living quarters.
Lots of bicycle trails in Calloway Gardens.
Conducive for rallies and pot luck dinners, etc. Few local restaurants of any size. A true "gathering" 😁.