It could a proprietary setup. I know there is DC power on the camera cable to provide power. You could distroy any camera you connect to it. I purchased the GM rear camera when I got the truck and had the dealer install it under my watchful eye. It's mounted on the center line of the trailer and 4 inches in height above the camera height on the tailgate. It is HD quality and works very well. Calibration and holding calibration for the transparency view are other issues I am having trouble with it.
I'm NOT 100% sure, but yesterday I added a plug to simulate that a trailer was connected to my 2020 GMC 2500HD Denali truck. I now get more camera views (side views) that are not available unless there is a trailer connected. I added a 50 ohm resistor to the running lights and Right/Left/brake light terminals on the plug to the ground terminal. So on the plug I have 3 terminals with a 50 ohm resistor to ground. I then plug it in to the truck and started it up. Yep! A trailer was detected. I setup a new trailer profile, "Trailer Plug". Disabled the theft detection feature. The 50 ohm resistors where rated at 1 watt to be safe. I determined the 50 ohm resistor by measuring the current from the trailer running lights when they were ON. About 1.1 amps. 14 VDC/ 1.1 A = 13 Ohms. To draw about 1/4 of that current, I increased the resistance to 50 Ohms. Then the power rating is about 14 VDC x (0.28A ^2) = 1 Watt. With this all said- your problem could be an intermittent wiring issue on your trailer. Running light circuit or right/left/brake light circuits. Your electrical ground is routed thru the connector, so that could be intermittent as well.
My 2020 2500HD Denali Duramax came with the towing package and had 4 TPMS sensors in the glove box specifically for adding to the trailers. When I replaced the Chinese tires on the trailer I had these installed. I purchased an activator tool from Amazon for about $15 to sync each tire TPMS on the trailer to the truck. Worked first time. A great feature to monitor not just pressure, but temperature as well. I suspect these can be ordered from GM- but may be expensive.
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