I can see my hitch ball with the factory back up camera and have a center line on the monitor so I can usually hit it the first time. I also use an 8 inch extension to gain better clearance so that pushes the ball even better in to sight.
There are wireless back up cameras to be used for hitching up. I watched a guy place two cones on either side of the trailers a frame and then he backed up till the back corners of the MH just touched the cones. A spotter if one is available.
Friends can't see the hitch but found the tennis ball on the end of a magnetic pole gimmick tool stuck up high enough to see in the camera. He then placed tape on the front of the trailer and when the tennis ball and tape line up in the camera he usually within an inch of perfect.
