If you're reading this and even remotely thinking about renting a Kúkú for your Iceland adventure, stop now and book it. Seriously. They're that good.
We rented a Kúkú for our 5 day adventure around Iceland's Ring Road. Our Kúkú, which we named "Polar," carried us, all of our gear, food, and bed through rain, fog, dirt roads, and 70+ mph winds without a hiccup. The campers are set up ingeniously. There's a storage unit that sits on the back of the camper holding three huge bins that securely hold all your cooking equipment, your bags, and a ton of food (we only went to the grocery store once during our trip). It also doubles as a privacy screen. The gas mileage was also great, which helps a lot if you're trying to keep the cost of your trip reasonable.
If we could give Kúkú's customer service more than a five stars, we would. From the initial inquiry emails asking for more details before renting to replying almost instantly while we were actually in Iceland, to providing us with extra sleeping bags to keep us warm (for free!) - they were truly a pleasure to rent from. We even needed to keep the car longer since we booked our tickets late for the Blue Lagoon and miscalculated the time we'd need to drop it off - they quickly replied that it was not a problem and we were able to enjoy our afternoon without stressing about the time.
Lastly, one of the coolest factors of renting a Kúkú was that they instantly made you part of a travel community. Any other Kúkú camper we passed along the way (they're easy to spot) would give you a thumbs up or a wave and even help out with anything. All the campers have unique and humorous art that even made locals laugh.
The only thing we'd mention is that if you're a taller person, you may want to spring for their bigger campers. It'd be a tight fit for someone taller than 6ft. We were two people around 5'7" and fit super comfortably in the back.
Truly, if you are looking for an awesome, comfortable, and stress free trip we couldn't more highly recommend Kúkú Campers!