Christine is super friendly and answered our questions almost immediately. The car (Darryl) is definitely a bit older and it has some things you need to take care of (e.g there is a no signal that the lights are on). But Christine will tell you those things at the check-in.
All in all we enjoyed our stay, but we would ONLY RECOMMEND renting a camper, if you are able to plan your stay many weeks in advance. This is due to the bad campsite-availability on Maui. We tried to book official/governmental campsites 4-6 weeks in advance, but we have no chance (early October).
Even if: For visitors (non-locals) the fee is often $50 and more per night and vehicle without having a lot of amenities.
So we had to take some private spots, which seemed to be barely legal sometimes, but costed the same. It seems to be, that there are to many campervans for just a few campsites. We met a lot of people with the same problems.
So if you cannot book the campsites 8 weeks in advance, you could have a hard time finding campsites. Otherwise Christine is a great option.