In less than 24 hrs., the problem was fixed - Oliver service is the best, I had planned to get the bolt and do the repair, but Oliver said no just bring it by, we'll get done. I got there at 8:30, headed home by 10. The service guys n girls are top notch. Richie and Jason, Cindy on the phone, and the other folks - Thanks.
The bolt had some wear where it had backed out, but we had no clues what drove it to loosen. They replaced it, put a little anti-seize on it, torque to 43lbs, and I was gone.
I do carry a grease gun and associated stuff, but NO I don't service it every 3k miles. How that would effect the bolt and nut to part ways escapes me, but what do I know.
I am going to put together a quick checklist to ensure I do a complete visual at each fuel stop.
RB