What an excellent idea! If you’re on the fence about staying in a camper van, let this be your sign to take the leap! I rented the van with my partner for 4 days and it was a fun, convenient, adventurous way to get around Maui. We were able to spend almost 3 days exploring the Road to Hana (my favorite part of Maui) and then camped on a beach south of Lahaina as well. The van is older but well maintained, new tires and is quite spunky. It came equipped with a stove, some butane canisters, and all cooking utensils needed, as well as a beach mat, some chairs & snorkel gear. The mattress in the back was quite comfortable to sleep on, and the van also came with portable fans for added comfort. I would note, since it is an older vehicle, there is no Bluetooth or aux port. To listen to your own music either bring a speaker or a Bluetooth car adapter that connects to a cigarette lighter. We used outdoor public beach showers to stay clean, and most campsites had at minimum port a potties.
The host was very communicative and helpful when it came to finding camping spots and other activities around the island. I would rebook this van in a heartbeat.