Hi, Peter! You couldn't be as crappy at backing a trailer as we were in April of this year with our first. And May and June and July.
Your wife won't listen? Why should she (you mean if she is backing up?) if you are crappy at it??
One tip I read was that the only direction someone should be giving is just that: the direction. In other words, point to the left from behind the trailer if the rear of the trailer needs to go left. That's it. Do not say which way to turn the wheel or any other such advice. Each person needs to basically know how to back the trailer already in order to take direction. (If you tell the driver which way to turn the wheels, he or she won't be any better next time because the instructor, in effect, backed it for the driver. In addition, people who are new at it cannot give direction as they will tell the other one the wrong way to turn the wheels much of the time.)
I wanted a camera at first but we do not have one. I backed the trailer into our storage space today (which is much more difficult than any campground site) with no problem other than being a little slow.
I will suppose that you have done a good deal of backing a trailer already. For any newbies, if you want the back end of the trailer to go to the left, you turn the TV wheels to the right. That takes practice as it is easier to get mixed up than one would think.
For your interest or anyone's who is new at this, here is my best advice on backing:
Get out and look at the situation several times while backing to see where the trailer wheels are going and where you want them to go. When backing the trailer to the left, look in the left tow mirror. If the trailer is going too sharply to the left, pull the trailer forward just a few feet such as six feet or so to straighten it some (if necessary, depending on how far you have to go back.) Then adjust the vehicle's wheels so that you will not turn as sharply. Usually, you barely need to turn the wheel to get where you are going. People often turn it way too much.
Back it again a few feet, looking in the left tow mirror again. Get out and assess again where the trailer wheels are going and where you want them to go and adjust the TV wheels again accordingly. You have to look at those TV wheels closely to adjust them. Just keep doing that and you will be exactly where you want. Or close enough.
As for the camera, it could certainly save you the time of getting out a few times but you have to get the wheel adjustments straight to take advantage of a camera. That means that the only real function for the camera is to tell you which way the back end of the trailer needs to go. One person can do that for the other one. When it comes down to it, the camera is only of use if you travel alone, unless a companion cannot give direction or is otherwise occupied.