(My wife and I are recent college grads) LOVED THE VAN! We were very sceptical about living in a van on Oahu. We were worried about finding places to park, where we would stay, showers, etc. We had no Campsites reserved ahead of time... and it worked GREAT! We found places to stay every night in locations we loved! We planned places to stay before we came and never used one because we found better spots when we got here. Online makes it sound like you will go to prison for parking and staying overnight and that is not the case at all. Out of our 8 days we stayed, we were politely asked to move our van only once and even directed to another spot 3 min down the road.
Stayed 8 days in the van and our 2 phones (used moderately) only drained the generator to 75% so I would not worry about keeping electronics charged.
Of course we would have slept better in a real apartment/house and we're not sure If we would ever commit to live the real van life, but we have no regrets for visiting Oahu this way.
The hosts are AWESOME! I've stayed at many Airbnb's and very few times have I communicated so much and so well with my hosts.