The "prewired" ones run off the power for the running lights. There are kits made to replace the center light with a camera mount. I believe my Furrion came with the mount, but mine had it from the factory.
I have the Vision 2 wireless observation model with a 4" screen on my travel trailer that was delivered today. I pressed power on the monitor after plugging it into a 12v charge port, and within a second or two of turning my running lights on I had a crisp, clear picture. I know I don't have the distance to cover that you do, but driving today in rainy weather I had no issues with the picture. With it mounted just below my rear-view mirror with the supplied suction cup mount I had 5 bars on the little reception indicator (like a cell phone) the entire trip home. When backing into a tight space it has a set of graduated markers on the display that can be removed if you so desire. Between those and my mirrors I had a good view.
Our dealer threw ours in "free of charge" (heh) as an RV show special. I was planning on buying one anyway because I might not have my wife available to spot me because the kids and dog will want to get out after a long drive, and I want them far away while I'm backing up. One trip from the dealer to the storage lot affirmed that I made the right decision for me.
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2019 Rockwood Mini Lite 2509S
2018 F-150 XLT FX4 Crew Cab 3.5EB 3.55
Equal-i-zer E4 hitch 1,000lb bars
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