Thanks for speaking up! I will agree with the comments to be careful about what you state online, although what you've said so far is sufficiently vague.
Regarding trust, the best solution is to have ironclad contracts, and that is where to spend money on the right lawyer; someone experienced in your specific field who can quickly craft contracts tailored for your needs that covers all eventualities. That said, have someone review what agreements you have in place before taking any action or claiming anything concrete in public or online.
I, too, have been hamstrung discussing the process here, and am glad despite the setbacks that you've found a partner that should be easier to work with. I think those with first-gen Superchargers will need to collaborate if we need to keep this equipment running reliably.
At the very least, I feel like what's been accomplished so far is more than sufficient to convince the right angel investor to fund a second generation. I don't have such contacts directly, but can ask around to see who might be available.