> in this particular instance it is the installation of an auxillary batter=
y
> for powering fridge on camping trips.

If that battery is charging from the car battery and loaded only by
the fridge then that would be OK. Particularly if the charging current
is under some sort of management (eg step-up and regulation) but
even so, the low resistance of the chassis will hardly impede decent
charging if there was a direct or diode connection between the two

Joe
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