Great advice from Sweeney. My one refinement is that Alea & I use only two hand signals - keep coming and stop. That is because Alea goes to about where she wants the galley to be when we are parked. She looks to see which mirror I can see her in. She then stands where she wants that corner of the galley to be located. I simply backup toward her, and as I get lined up on her the van and camper eventually straighten out and then it is straight back until I get the signal to stop.
This method is quick and easy, and allows me to keep an eye on whatever is around me, since I don't need to worry about missing a hand signal.
My two cents would be that people have been backing up campers in analog mode for a long, long time. It isn't often that I see campers with their back ends crunched, and I suspect some of those are caused by being rear ended. So having a back up camera probably isn't all that necessary. If it were me, I'd get a drone equipped with a camera. Have it hover where it has a clear view of where you want to park, then back away. At least then you have something to amuse yourself with at the campsite (and possibly annoy your pesky neighbors). ;-)