As you rightly point out, the main issue with wireless reversing cameras for motorhomes is the distance between the screen by the driver and the camera at the rear may be long enough to result in a poor signal between the two. A wired camera set up avoids this issue, but if you do not wish to fit a wired camera or have one fitted, we would suggest looking at a wireless camera from Auto Vox who have a range of cameras at various price points.