Got the 'Burban back last night. Dealer said that they were unable to reproduce the concerns I had. Even though they initially said that the front struts were shot, the master tech says actually they aren't. It seems that they had initially attempted to replace the front struts but once the master tech examined the install, he vetoed it even though the extended warranty covered it. Supposedly they removed the parts.
The master tech said that he could see signs that the magna-ride could be in early stages of failing but nothing was occurring that would necessitate a warranty repair at present. They did offer to do a "preemptive" repair for $2500 out of pocket. I declined.
When I drove home there was no squeak and the ride seemed fine. I'm planning on doing an hour drive with my wife this afternoon to the outlet mall to see how it drives. I'm hoping to keep that trip under $2500.
I plan to keep a watchful eye on the suspension. My warranty expires in the fall of '26 so hopefully if its an issue before then it can be addressed under warranty.
I haven't had any other issues and as I said, after the Route 66 trip we'll have to figure out what to do.