Finished mounting one on my K5 this summer.
The dash had already been cut back in the 80s in favor of an Alpine head unit (you remember how cool those
quintesential mint green square buttons were). If your dash is already cut then JVC had some clean touch screen units from their KDX-AV line that could pop in there. An integrated monitor inside rear view or a windshield mounted monitor would be better options so you're not hacking up your truck dash but in my case someone already did it so why not make use of it?
Wiring was easy- both power and signal on are sourced from the same reverse light power. Wireless would have been nice to prevent running a wire from the camera to the monitor.
The lift, tiny sport mirrors, rear bench seat back rest and spare tire all add up and make a 15-20 foot blindspot directly behind the Blazer. Personally, the camera went in because I've got little ones I care about. It's a huge help knowing what's behind me instead of hoping nothing is there.
Color coded back up sensors are inexpensive and could be mounted in the bumper but it depends on how far you want to go with it.
There are lots of decent inexpensive options on Amazon.