I also got a Rear View Safety wired system for my Class C. Used it as a rear view mirror since the actual mirror had a very limited view.
Mounted inside to avoid drilling and weather. Worked great. Has a wide angle lens and other vehicles were much closer than they looked. It gave an excellent view of my car behind and what was right next to my car. Used outside mirrors for stuff further down the road. Good for maybe 50 yards behind my RV, then went to outside mirrors. Plugged in to Cig lighter.
It does have lights that come on after dark and make it sort of useless. However, I always, except once, never drove at night.
I read a lot of bad things about wireless systems and went with the wired for no interrupted signal.