The ETC was moved forward on the A-8 to compensate for the aux tank. That is why you don't see inner wheel covers on late model 190s.
Yes, but the presence or absence of said ETC tank could be important in plans like the picture you posted. That's what I meant.
I've heard a comment or two that the ETC was always loaded on A8s with AUX tanks to counter balance it (or help, at least), as most photos seem to have it even if nothing is loaded on it.