I got a little more info on that driveshaft. The company that makes it is East Coast Driveline (link posted). There are three drive shafts available. Two in carbon fiber for just over 2100 and 2300 with different performance specs and there is an Aluminum option for about $1600.00. They do not supply the flanges so you will either buy it without them or you can send them yours to be put on. The slip shaft is Aluminum on Aluminum rather than the OEM which is Aluminum on Steel. They stated this resolved the issues with the driveline.
We all know that a new shaft or grease resolves the issue for about 3k miles so I asked the guy if he could reach out to a couple TRX customers to see how they are doing past the 3k mile mark. He took my email so I hope to hear back soon. But this seems like it might be a viable option
Made to Order 2 Days Lead Time to Build and Ship 2021-2027 Dodge Ram 1500 TRX 6.2L V8 HD 4” or 5” Carbon Fiber or Aluminum Driveshaft. Mopar (53011135AF). DS-RamTRX-4A, DS-RamTRX-5A. Replaces: 53011135AB, 53011135AC, 53011135AD, 53011135AE MUST SWAP OVER OEM FLANGES TO NEW DRIVESHAFT (DIRECTIONS...
ecdriveline.com