If you're on the fence about this truck – DO IT! They thought of everything in stocking this truck. Even if you're an amateur car-camper you'll find everything you need here. We brought a trowel to dig catholes for off-the-grid "bathrooms" and extra trash bags. Also consider your own quick-dry beach towels to complement the towels they give.
If you've never used a hardshell truck tent before, download inst to your phone. Same w/ Jeep's 4x4 -- depending on the season and amount of rain, you can easily find yourself needing to engage the Jeep's impressive off-road capabilities and trying to learn "on the fly" in the middle of a washout or mudhole is not the right time.
The hosts will give you pinned map locations of some unsanctioned camping – do it!
Those around Hana are in my opinion better than around Lahaina on the south shore. The southern spots are literally right off the highway and often have homeless encampments. North shore is more remote.
All in all, legendary!