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OEM-style replacement tow mirrors are too expensive for my 2020 1500 ... at least for me. I'm using these snap-on mirrors when towing travel trailer. Mirror is manual adjustable, but have been good enough for the price. Also, my truck doesn't have camera and puddle lights. There is some image bouncing in mirrors, but not a issue for me. https://a.co/d/dtArREU

Do you have solar panels on the trailer? I read somewhere that a diode needed to be installed on the trailer light plug to eliminate the 12v "feedback" to truck from the solar system.

I've noticed stations are now posting price for E15 gas (88 octane) that is 10-15 cents cheaper per gallon than "normal" E10 gas (87 octane). Really have to be alert when selecting pump handle if you don't want to use the cheapest E15 fuel.

You may need software update from dealership. TSB 23-NA-053 Radio Software Version U168 Update. I had blank screen on my 2020 Silverado 1500 until this was installed. Check out this post with link to TSB:

I could not get my Trailer Light Test to work last week with myChevrolet app for 2020 Silverado with Advanced Training option; kept getting System Error contact Support. Had to uninstall app and install again and problem cleared.

What a relief...congrats! What kind of grounding strap did you use? Does an insulated battery cable with pre-installed terminals work okay?

Could be the dreaded bad grounding strap. Check out this post: 2019+ Silverado Electrical Issues Attributed To Braided Grounding Strap - 2019-2025 Chevy Silverado & GMC Sierra Troubleshooting - GM-Trucks.com https://www.gm-trucks.com/forums/topic/260048-2019-silverado-electrical-issues-attributed-to-braided-grounding-strap/

I think it is for the second camera for inside a trailer. My blue connector also was not attached to the second camera port on bumper (with 7-pin receptacle.) Pic is what my unattached camera harness looks like on 2020 1500 with advanced training option.

I have not done brakes on my 2020, so I cannot give much helpful info. But, did you put your truck in brake service mode before starting work? I found this on YouTube. Good luck.

Software update available for trailering app blank screen. Also, on my 2020, a body control module had to be replaced for the optional trailer camera to work in the trailering app. Technical Service Bulletin No.: 23-NA-053 Date: March, 2023 Subject: Radio Software Version U168 Update

Go to radio settings on truck and make sure Car Play icon is selected to be active (not hidden)

I was randomly seeing the notice to check trailer wiring on my 2020 LT when towing travel trailer, but trailer brakes and lights were working normally. Dealership found stored code C1114 (no MIL) and gave me this TSB. I bought the Pollak 12-706 trailer plug from Amazon and have not seen notice since, despite the Pollak plug being thin plastic. Good luck. TSB 21-NA-155, Date: June 2022 https://static.nhtsa.gov/odi/tsbs/2022/MC-10214860-0001.pdf Subject: Information on Check Trailer Wiring Message and/or Service Trailer Brake Displayed on Driver Information Center (DIC) - DTC C1114 Set Engineering has recommended the use of Pollak Heavy Duty 7-Way (Trailer Side) Connector Plugs. Pollak is the OEM manufacturer of the truck's 7-way connector socket; and by using a Pollak Heavy Duty 7-Way (Trailer Side) Connector Plug, this will ensure proper fit when the twoc onnectors are mated... (example 12-706, 12-702).

I need more light too! How/where did you connect them to work with the factory dim lights?

Make sure trailer light wiring matches truck. The 7-way trailer light receptacle on our trucks is wired for RV. Some utility trailers use a different 7-way wiring pattern.

Check YouTube for companies that have bumper upgrades. I found a good video to help me replace my rear bumper on a 2020 Silverado after a bumper bender. The rear bumper replacement was not difficult: release the RV receptacle, 2 wiring harness and 4 nuts.