Running trailer from tow vehicle inverter

SoundGuy wrote:

boosTT wrote:
Why not just use jumper cables from the truck battery to the trailer battery?

The truck's voltage regulator will limit voltage to well below what is necessary for a correct bulk charge - 14.4 to 14.8 volts, depending on the battery. This is where a DC > DC charger shines as it avoids this issue and will allow the trailer battery to bulk charge properly.

That may not be accurate. A user would have to measure voltage/amperage with both batteries connected. It may be that using jumper cables pushes more amps into the depleted battery than the daisy chain of inverter->converter-> depleted battery. I know if I wanted to use my truck as a charging source for depleted batteries, I'd use jumper cables. I wouldn't expect to put a full charge into the battery, merely sufficient charge to power up necessary devices on an emergency basis.