Forgot to mention: We tried the radios for a while when we first started out. But since I would forget them if we didn't leave them in the truck, that's what I did. Second time out, we had dead batteries. Replaced them real quick, and got through the process. Third time out, dead batteries again. I guess they just can't handle sitting in the hot truck for a month. She also had the bad habit of not giving the radio a second to transmit before she started speaking, so all I would hear is a click on my end. I tried to train her how to use them, but it didn't take.
Cell phones usually don't work where we are, so that's a no go.
We've stayed many places where an RV park staffer escorts us to our site and spots/guides me into the site. DW LOVES this; she just sits in the passenger seat those times.
We have our process down pretty good now though. We have only 2 difficulties: 1) She doesn't seem to think staying in sight of my mirrors is important, so we've had a few times where I'm just sitting there waiting on her to appear again, and she's waiting for me to keep going. 2) She doesn't understand the hand motions of go/stop. We've worked it out that as I get close to something, she begins with her hands spread apart and brings them closer as I get to where I need to stop, when they come together, I stop. She thinks the space between her hands needs to represent actual distance, instead of just a representation of how far I have until I need to stop!
So she'll typically just wave me on with her fingers until I need to stop, then she puts both hands up, palms out, I stop. If I don't, she yells "STOP!" (my windows are always open).
We do okay now though. She still hasn't let me hit anything (yet, knock on wood)!
As far as saving the marriage, just come up with a system that works for YOU and go with it. If that means one of you has to walk away for a few minutes and leave the other alone for a bit, then so be it.
If you're going solo, the GOAL becomes VERY important. And DON'T FORGET TO LOOK UP!