I have tried a number of them, the latest was the Swift Hitch. I had to send them ALL back for a refund but I was out shipping in both directions plus restocking fees. It has cost me a bundle to be a "test" site for all of these so called wireless backup cameras.
I wanted one to use solely for hitching up my 30 foot Pace cargo trailer to my 40 foot motor coach. The rear view camera that came on the coach is not for that purpose and I was tired of having "disagreements" with my wife.
After all of the trials I was about to give up when I came across a Tire Pressure Monitor Company that also sold a wireless backup camera. I talked to them on the phone and was given the assurance that if it did NOT meet my expectations I could send it back without ANY charges whatsoever. No out of pocket expense.
I ordered one and tired it out and I notified the company that I will not be sending it back as it was the FIRST one that actually worked as described. It give a great useful picture with the monitor suctioned cupped to my driver's window and the camera is suctioned cupped to the engine cover in the rear looking straight down over the hitch ball so I can line up the trailer tongue directly over the ball.
The screen is clear with no lines or snow BUT the image does dropped out for a second or two sometimes due to communication between the two devices. That is not a problem for me. Having a clear usable image on the screen is MANDATORY.
The system comes with one camera and monitor but it is expandable by adding up to three more cameras. Everything is 12 VDC powered.
The company is a "recommended vendor" for this forum and is called Truck Systems Technologies.
Vehicular Camera System - Truck System Technologies, Inc
I do not use their TPMS for many reasons but I do recommend their Backup Camera System.
I checked out the iBall camera you had mentioned in your post and the only way I would TRY it is through a Amazon purchase so if it did not perform up to my expectations it would be sent back. Amazon is very good in returning stuff to them. The ONLY downside to the iBall Camera is the frequency that it uses is the SAME as Bluetooth so there could be some problems using it if any Bluetooth devices were being used in the area. I use a Bluetooth Hands-free device for phone calls so it won't work for me.
Dr4Film ----- Richard