We plan to camp at Fort Pickens in Florida and there is no full hook ups. The holding tank is like 20 gallons for black and gray, so total of 40 gallons. Its too small for a family of five to camp thr...
Get a portable tank and learn how to use it. You won't make a mistake more than once. With your current tank size you will fill the gray tank after 24 hours with 5 people. Hard to say on the black tank but you may make it 3 days with careful use, may not.