Took mine down yesterday and apart one snapped bolt there is minimal amount of rust. It actually look like someone took care of reffiting rubber seal because it looked new. But cleaned it and refitted handle without hassle. either that or above rear window in the plastic trim. But i think spere wheel will obstruct view. and I do not really like to fit one of the truck ones with big metal holder.
How about mounting the camera on some sort of bracket the allows it to peer through the gaps between the spokes of spare wheel?