Appreciate all the replies and info, this is quite useful. 52Carl, your description is exactly the issue, I didn't get the chance to move it today but at some point this weekend I'll give it a whirl and take it for a test drive.
I do like those rectangular mirrors, particularly (for mine) the smaller mirrors; they both look good it just gives a different look to the truck. It's a safety issue as I say, I do like being able to see when I'm backing up.