My wife does excellent pulling the boat and backing down the ramps. Her only issue is hooking up by herself. I will check out the camera in your link, it looks like it should fill the bill.
Hooking up to a trailer with a camera that allows you to see the hitch ball is simply glorious!!!
It really is a game changer. Some of the newer trucks even have automatic parking brake when you are in tow/haul mode so the truck doesnt roll a bit when you put it in park after you think you have it lined up perfectly.
I would like a wireless back up camera for my motor for when I am backing into the garage.
That would be handy. I know the new GM trucks allow you to add bluetooth cameras to them and you can view them on the display. Pretty handy for the back of a camper or like you suggest your motor.
What I need is a glide path indicator for my boat that can direct me on final approach when the current is ripping 5mph in one direction, the wind is howling 30mph in another direction, and the landing is completely submerged in high water and partially obstructed by a tree that has gotten lodged on the submerged dock.
That I ball in the garage might be good, 2 years ago I would have run out to buy one, but I have gotten a lot better with practice (the answer as always is to fish more!)