Yep. And it is SO OBVIOUS isn't it - now that you have thought about it.

And in retrospect, it is so obviously used everywhere - like 4-wire sensors, voltage regulation at PSU outputs (after current shunts, copper losses, transistors etc), and any good distribution system.

You can extend most regulators - even LM317 3-terminal adjustable voltage regulator (but not the LM 78xx & 79xx - they are "fixed").


For cars etc, if you do NOT have the single-wire D+ type alternator/regulator, you can usually extend the reference to the battery - even if it is in the boot/trunk.
Then who cares if their is a 1V or 2V drop from the alternator - the battery voltage will be spot on (eg, 14.2V).
That's why I like the (newer - ie, 30 year old) S-types - usually only a few uA is consumed to a long thin wire can be used. (Some like might be ~10mA-15mA - akin to a LED, but that is still a small wire - you can even omit the fuse!)


If over-voltage at the alternator is a problem for the front battery or front loads, then a chopper will reduce the voltage.
And that MUCH simpler and cheaper than up-converting from front to back. IE - over-set your alternator and then cut back excess voltage.
(Australians tend to buy $300 & $500 20A & 40A dc-dc converters to boost voltage to the back instead, but that's 'cos they are gullible or stupid.)