I know that Rover...the PO used to live three blocks away, that is, before he got posted to the UK. The Rover didn't make the trip and was sold.
It was in pretty good nick back then, but that was a decade ago.... Even with all that sail area, the Iron Duke engine allowed a reasonable pace on the highway.
Jen's right about the military undercoating - it can either be a blessing, or a curse, depending upon the mood of the squaddie who was tasked with that first application. Sadly, on a Rover there are plenty of places for the rust worm to hide....