From the Reserve America site for Wharton. Might want to check the campsite your considering;
GENERATORS - May be used except during quiet hours. If the use of a generator is deemed unreasonably loud by the facility staff then individual use of a generator may be prohibited/limited.
Clean sine wave battery power supply than can be recharged from an electrical outlet, car outlet or solar panel, available in several different capacities. I use it in my own woods and it's also handy around the house during power outages. Completely silent, no fumes.