Thanks for the explanation,
I have everything back together because the belt arrived this morning. The belt runs true on all the pulleys and idlers. There are 56,544 miles on our coach so our idler bearings didn't make your predicted 80,000 miles, but even if the new bearings don't go another 50,000 miles they will outlive me. I have the tools to drill and tap for grease fittings but didn't bother to do it.
Thanks, Sam