the rear sensors are turned off when you plug something into the trailer hitch. or you can turn off the switch.
when you take tailgate off there is a connector that comes with the truck you should put on the wire harness that disconnected from tailgate. but if you have a bed camera it will still work, but all you will see is the camper.
if you have sirius xm you will loose coverage lots of times with camper covering roof (unless you add a secondary antenna out on hood).
everything will still work.
my favorite truck was the ram with all the options, those cooled leather seats were great.