The T60 is the tender for the C60. Counter intuitively perhaps, a big tender is a good fit for the harryproa philosophy of making boats simpler, lighter and cheaper as only one engine is required rather than 2 or 3. It is also safer because it is more stable than the typical inflatable or small tender.
The mini cargo ferry was designed in response to a need to replace the outboard powered fibreglass skiffs which are ubiquitous in the Pacific. These boats are expensive to run, difficult to maintain and have almost completely destroyed the islanders boat building and sailing skills.