Great experience for my fiancee & I!
However, here are a few things we would recommend if considering these rooftop campers during your time on Kauai:
1. Book campsites well in advance (if possible)! Not all campsites on Kauai allow rooftop camper setups, and some require permits/reservations to use. We stayed in both the campground at Koke’e State Park and Kumu Camp during our stay. Both were great and required permits/reservations, but Kumu Camp was definitely the more “comfortable” of the two.
2. Ensure all items listed to be included are in fact in the vehicle and in good working condition. We were missing a few items. In particular, make sure there is a lighter included in the vehicle so you can cook.
3. Many hiking spots (i.e. Kalalau Trail) require reservations well in advance to enter the park areas where they are located, especially if you will be accessing by car.
Again, overall great experience and hope you are able to enjoy as well!