Nada shows a bogus "dry" weight of 3426lbs.
so, it's actual UVW/sticker weight from the factory, will be around 3800lbs.
so, loaded for camping, it'll probably weigh at least 4300-4500lbs.
now your Enclave's 5000lbs. towing capacity is rated with only a 150lb. driver in it. any other passengers or cargo in the car, will lower that 5000 number by each of their weights.
bottom line: you'll be at or maybe over the max capacity of the Enclave.
you'll have to load light and not carry water.
but stay away from any mountains, you'll burn that Buick up.