TPMS failure, loss of cruise control, ABS and Stabilitrak lights on and key fob failure?

Yep, the first thing to do is do a CAN scan, this video will show you how.

CAN SCAN - https://youtu.be/u-4syLc-ifQ

My gut on this one is the RCDLR programming/setup or module mismatch first, low voltage, ground, network second and BCM last. The cold-weather clue is important, but both fobs dying after the truck sat also makes me want to see whether the replacement RCDLR was properly learned or configured but the scan will help us see what is going on. Please get back to me with the codes.

I did find the fob problem yesterday. It was an open RCDLM Tx line somewhere under the front seats/center console. Well, not quite open. I was reading about 2 megohms between the RCDLM plug and the X2 plug on the BCM. I ran a new Cat6 pair from the RCDLM to the driver's side wiring channel alongside the front seat, bypassing the Rx line as well. I didn't want to pull the seats and mess with the air bags. The other symptom(s) may rear its ugly head when it gets cold again. Possibly this somewhat open transmit line was somehow disrupting the CAN communication and causing all the issues?
BTW, I've read the RCDLM is plug and play. I had purchased a new one a while back to see if that was the problem. When I was all done yesterday, I plugged in the new one to verify and it worked just fine out of the box without any programming.
I had the truck into a Chev dealer and also a local GM Certified repair shop but they weren't able to find the fob problem.
The codes they pulled off were: C0750/55/60/65-03 &-29. These are TPMS codes. The rest are B316B, B3600-03, BR7E, B1325-03, C0110-61, C0159, C0775, U0073, U0077, U0126, U0140, U0422-71 and U0415.

If the RCDLR transmit circuit had around 2 megohms resistance between the module and the BCM, that circuit was basically unusable. The ABS/Stabilitrak/cruise issue is a little more separate, but the code list gives us clues. Codes like U0073, U0077, U0126, U0140, U0415, and U0422 point to communication/data problems between modules. At this point, I would do this:

1. Clear all codes from every module now that the RCDLR wiring has been repaired.
2. Drive the truck and see what codes return first.
3. Confirm all four TPMS sensors relearn correctly.
4. Verify both key fobs work consistently from normal distance.
5. Load-test the battery and check charging voltage.
6. Voltage-drop test BCM, RCDLR, and ABS grounds/power feeds, especially when cold if possible.
7. If ABS/Stabilitrak returns, focus on the ABS/EBCM/steering angle/yaw/brake pressure 8. data instead of the BCM first.

Please let me know how it goes.

Thanks for your input. Hopefully the other issue will not reappear come cold weather.

Yep, let me know if it does.