None. The trailer comes with a 12v compressor fridge, and the usual other stuff, like 12v water pump, 12v controls for the furnace, etc.
And that's my point. Why go with the more efficient, yet non-conforming higher voltage systems? I only ask because my learning process includes videos of people that have made beautiful systems, come back and say if they could do it over, they'd opt for 24v or 48v.
I could see it in a bigger rig maybe, but that's why I'm asking. I'm not the sharpest knife in the drawer and don't want to make an expensive mistake.