2020 northern lite 811 exle wetbath

Don't don't why the lights flashed, somebody is going to let you know. But you do know that if you leave your trailer plugged into your TV for a long time it will run down your tow vehicle battery if lights or other devices in the camper are in use

That makes sense. Thanks! Also does anyone know if or how you can pair the rear view camera on the camper to your truck screen. I have a 2020 gmc Sierra 3500. Or do you have to use the separate screen that comes with the camper?

Might have to put the fuse in the under hood panel to separate truck from camper. I know this was true in older GM’s.

Congrats on the new TC. We've a 10.2 on order and an F350 coming as well.
If I had to guess, pairing a non vehicle spec'd cam with the stock unit probably isn't going to work. BUT, one never knows.
Someone local to us both, who is a former electronics professional, is on YT. "Love Your RV" is his channel. He's a 5'th wheeler, but does lots of reviews, including cameras. He'd be a good guy to ask. Check his YT channel as I believe he's got a link to a website you can PM him. He's very nice and had some good advice for me when buying the new truck. He's wintering up Isl this year as they couldn't get south as usual.
One thing about having the separate screen is you can take it into the camper with you and use it as a security monitor. If you get a knock in the we hours, you know whether to grab your I.D. or the baseball bat. :)

As for the tail lights. Give NL a shout. They have a reputation for quick responses and caring about after purchase help. I always got in the habit of unplugging the TC with our old one. Had the isolator fail once. They can and do fail so better safe then sorry.
Please post if you find the problem as it's good to know for future readers.