I didn't think I needed to explain all the details as somebody else had already covered/alluded to it. Sorry, I should have been more explicit.
To simplify it, a RRS (up till the latest ones) were basically a more lux body and interior on the same running gear as D3 & 4. There are RRS of the same era as the D4 that have this principle applied. The change over to the new chassis isn't that old and D4 has been around for over 6 years. So yes the YEAR isn't 100% accurate in my statement .... but you get what I meant?
I was trying to save myself from typing that .... LOL!!!
The relevance being .... an RRS is just as capable as it's D3/4 counterpart of the same era. That was really my only point.

