Rechargeable walkie/talkie
If you’ve ever heard “those” people yelling at each other when they are trying to back in a rig, I swear it’s because they are just losing their hearing. I don’t think they do it as a way of fighting, I think they literally cannot hear each other. Besides, if one spouse pulls a bone head move, think how nice it is to swear at them in a quiet way over your walkie talkie instead of yelling it through the campground. Our process involves one of us guiding no matter where we are, so we use these every time we pull in or out of a spot. In fact, we purchased a backup camera for our rig, but don’t even use it anymore. This is a lot cheaper than that and way more effective.