Lucas - a suggestion, if I may... On this forum we find a broad array of individuals who have a vast array of talents. The development of the Eco autopilot is, as you have mentioned, progressing at a slow pace as it is not TruTrak's highest priority. That's OK - everybody has to work to their own priorities.
With such a vast pool of talent available, would it not be a viable plan to solicit "Alpha" testers who would work under the guidance of TruTrak to develop an installation for each aircraft type? After all, those who built and have flown their airplanes for many years are more likely to know the "good stuff" like where to run wires and attach brackets. Of course TruTrak would have to vet the installation design and document it properly before making it publicly available.
Think of this as "crowd sourcing" a design using a crowd that has both a very strongly vested interest in the most positive of outcomes, as well as considerable technical expertise.
This same technique could be used on other kit types if it can be proven to work on the RVs.
Just a thought...