Good luck in your search. Most B/U camera systems are analog and it seems the best "HD" camera on rearviewsafety.com is an "analog 720P" camera.
Your "buzzing" sound doesn't seem normal and may be due to a poor ground connection in your setup.
Realize your system is modular. You have 3 discrete cameras that feed into a discrete multiplexor with triggers that outputs a signal video feed to your in-dash radio, usually with a standard RCA AV feed. I doubt your radio screen can handle, let alone display 1080P or 4K so if you want to go that route you will need a separate digital monitor.
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Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad - Selling
2020 Chevy Colorado Z71 Trail Runner Toad
2024 Chevrolet Trax 2RS - Soon 2B TOAD
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