Many folks think that backing up a long coupled trailer is more difficult than an short one. The opposite is true. A short coupled trailer will turn sharper with less movement of the TV. This makes it much more difficult to maneuver when backing up. Long trailers are much easier, but you need to either have a camera, spotter, or really good depth perception.
Even though I've never had a backup camera, I'm thinking about getting one. Not because I can't back a trailer up, but more for safety and being able to see a little kid or something that shouldn't be back there.