No single point of failure
The independent nature of the unit also means that all equipment functions as it should. In the 20 foot unit all precautions are made to ensure that this is so. The total technical infrastructure is engineered with parallel back-up systems for all critical equipment. There are many examples including the solar system (consisting of 3 sets of 2 parallel panels), the 2 parallel lithium Ion battery packs, the double drains in the grey and black water tanks, back-up pumps, multiple heating systems and so on.
The principle is that you can switch over instantly without losing time. Once you have reached a destination with the necessary facilities, you can make the appropriate structural adjustments or repairs.