Best wireless backup camera for 30' trailer

My Swift Hitch is being delivered today. I'm excited. I think it will be exactly what I was looking for. Just need to figure out a more secure installation to use it while driving. Currently I'm thinking zip ties, but maybe something a little easier to put on and take off.

I used a Swift Hitch Wireless Camera System for quite a few years, it's big advantage being both the camera / transmitter and receiver / monitor are each totally self powered and require no interfacing to the vehicle in any way. It can be used for any purpose you want but I used mine only for hitching up and for that it was invaluable. I only sold it last year as my current truck has a built in rear view camera which also serves well for hitching up but had I wanted to use it for parking on a campsite or monitor traffic behind me I'd have kept the Swift Hitch.

Not sure about the optional 2nd camera, but I've enjoyed my Furrion. I have a 37' trailer and it picks up the signal without issue.