Happy to share that I test mounted everything and it all works! Getting over 400W charging from b2b + solar! Have it charging on shore power right now for the initial charge.
Looking forward to not having to wonder if the battery will die over the weekend any more.
Jackery's fine for casual use but they're super limited for full-time vanlife - most models have low continuous output and the propriatary charging system means you're stuck with their ecosystem forever.