Chassis corrosion caused by common negative

[RogerIvy]

Has anyone actually experienced corrosion caused by a common negative (neutral) using the chassis?
I know the theory that a B2B based on common negative using the chassis instead running cables could cause some corrosion. Of course, this could only occur under very high current and probably with dicey connection (e.g. the strap).
The reason I ask is I've never actually seen it, and the alternator is grounded to the chassis via the earth strap anyway.

 

[Winger]

Just a bump but do you have a problem with corrosion?

 

[RogerIvy]

Just a bump but do you have a problem with corrosion?

No I don't.

Someone was asking me if he can use a common negative on his chassis and I was curious as to whether someone has actually experienced a problem with this approach. As you know there are loads of theories and opinions out there - I'm hoping for a practical real world experience.

 

[Richard n Ann]

It's more of a thing on boats isn't it?

 

[RogerIvy]

It's more of a thing on boats isn't it?

Many (most?) boats don't have a big lumpy metal chassis though, so in my experience boats always need to run both negative and positive cables. A common negative would simply be a joining of the two negatives at some point, so I'd not be concerned about some sort of structural integrity problem.
So, my question is in relation to motorhomes.

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[RogerIvy]

Just for interest, here is a chart showing various metals - the further part two metals are the more the galvanic corrosion.
This was taken from: here

 

[mitzimad]

wasnt this the reason we changed from positive earth to negative?