Thanks Lionelgee,
Yes, I would have done that anyway and can see that's what dugite has done also.
I consider if you're going to put a reversing camera in, you may as well have the ability to look backwards whenever you want or need to, not just because you're reversing!
I'm also considering using a bar bolted to the existing holes in the rear ROPS and mounting the camera in the middle of that. I've figured so far (and I'm happy to take further advice) that while the backs down I need the camera, but on the off chance I'm in town with the back up (not a usual scenario), I would just run off the rear vision mirror as I would normally, hence saving having to elevate it via a separate vertical pole, but I'm open to ideas here (;->