With Ford it is inexpensive to buy the wiring loom to connect a backup camera. The cameras are cheap, it is the hookup that can be involved. With GM they will only sell the entire assembly for around $400.
I did not want a backup camera that only worked when the truck was in reverse. I wired a camera to the running lights so I could turn the camera on while driving down the road. The backup camera on my truck is nearly useless when the sun is behind the truck. The aftermarket ones have sun shades and work much better and there are combo units with two cameras in a single mount so you can have one directed behind the camper and the other pointing down at the hitch.
I went with a Garmin 760 LMT GPS with its BP20 camera so as to have only the one display on the dash and easily switch back and forth between GPS mode and camera display mode.
Other places for video gear are tadibrothers.com and cubbycam.com. There are LCD displays that will work with up to 6 cameras so you can have side cameras as well as front and rear facing ones.