^Very informative response!
I’ll add, I don’t think a couple GC2s is overkill at all.
If you look up the OPs trailer, she’s a bigun!
Alternatively, 1 little group 24 battery (like in the kids 6 banger commuter car), it’s amazing it carries enough juice to even setup and break down the trailer. There is certainly no tangible reserve capacity there for virtually anything. It must come straight off the umbilical cord after it’s hooked to the truck and right back on the cord as soon as the truck gets shifted into park at the rv site.