Our roof tents 140L, 180L and 220XL series can be extended with our extensions. The extensions are unique because they have, in addition to the rear door, three access doors as standard. The use of windows makes the extensions more than just an extension for more storage space. You can comfortably live with 2 to 4 people in them whether the weather is good or bad. In warm weather you can ventilate sufficiently and when it rains you can just open the windows to look outside and let the light in.
The 220XL extension provides an enormous living space. And that is a good thing, because there are four of you sleeping in the rooftop tent. So you need space too. You can easily invite more than 4 people in.