I bought the same system from Rear View Safety that Northofu1 bought from Costco.
https://www.rearviewsafety.com/backu...5th-wheel.html
It has been problem free for 7 years now. Initially it was installed on our Springdale. When the tree fell on that trailer, we bought the current Cougar and I transferred the RVS system to this trailer. Excellent video and with 7 years of use, it still works just like it did when new.
At RVS it's $299 and they offer a 10% military/veteran discount.
With all the problems, "finicky wireless systems" seem to have, from the standpoint of reliability while towing, I'd suggest considering a wired system.
With 7 years of reliable service and never a problem with reception, power, interrupted service or product failure, if I were to find myself in a situation where I had to replace this system, I wouldn't even consider anything but the one that's worked so well for me. YMMV.