This was a great way to explore Maui. My kids and I camped at Olawalu - it’s a beautiful campground (try to reserve a a shady spot).
Sean’s vans are equipped with everything you need - sleeping bags, cutlery, high-quality mattresses, etc. We landed with carry-on bags and were able to camp without having to pick up any supplies (besides food and sun screen).
His spot is near the airport - a $10 Uber.
Olowalu was really great but the State parks are a bit challenging to book.