Bluetti 200 is the unit. The power consumption and keeping it connected when in motion is not as much of a concern as is the challenge of "connecting it to the trailer" part of it.
A normal battery charges and discharges from the same cables where as a power station has battery IN locations (for charging) and battery OUT locations (to power everything).
So I may be answering my own question and this may not be possible or at least not worth the hassle of trying to integrate into the existing wiring.
I have read that post and a host of others on various sites and it sounds like I really need to upgrade my converter to support Lifepo4 batteries or stick with Lead Acid and use my power station to extend that through its AC ports. The later is much much cheaper
