Is it a wireless system or is it a wired system? If wireless, what is the distance from the rear of the trailer to the dashboard of the tow vehicle. Unless technology has improved, one reason wireless back-up cameras never worked well for travel trailers is because the signal distance is not far enough to reach end of trailer to tow vehicle dash. That's why I never got a system, and hard wiring was something I never wanted to deal with. Find that answer first and then consider what your are spending your money on.
As far as being helpful? Absolutely! Anything to help view behind is a help!