A good thing to do IMHO is if DW is going to part of the camping trip, you need to train her with being part of the process. Took about 2 years to train mine (only time it's ok to ever attempt this :)), and now she's a pro and darn proud of it. :W
I started out with trusting no one and kept getting in and out of the truck to check where I was. Slow... Then we graduated to walkie-talkies and while that was a good improvement, it still wasn't enough. Wasn't until we learned hand signals together that backing in became easy, smooth & fast. For more challenging sites we use both hand signals and walkie-talkies.
Something I have found is that if you have been driving for hours, are tired and aching, hungry and need the restroom, it can help to get out and take break for a few minutes to re-energize before backing into the site and then it can be easier. We've also learned not to let fellow campers and/or CG staff to help back in, unless it's absolutely needed.