I have concluded that THE best solution for a mobile composting toilet is either a) The loveable loo design, or b) Nature's Head, which is the only commercially designed composting toilet with a simple enough design to avoid most of the nightmarish possibilities of the more complex CT's.
The catch is, it would only serve as a mobile toilet, and would most likely not be acceptable as an alternative to a septic system when it comes to land ownership ordinances.
So... it can serve as a temporary solution while we are living out of the little house, and then I will have to build septic or sewer connections if/when we build a permanent structure on land.
Though here is a thought... I am wondering if an outhouse is an acceptable alternative to a septic system. We could use the Nature's Head inside for the most part, but have an outhouse to meet the needs of the town/city as well as giving us a place to dump the waste from the Nature's Head.
So far, that's the best I've come up with...
Leaving work now. :)