Sorry to here about the muffler problems. But better to have it happen heading east than West. For some reason getting the road early after multi day riding tends to be a problem...I had the same issue on my epic 21 day journey from Maine to california via Canada. I found the key was get off the road early each day (by 2pm), relax, grab an early good dinner and turn in by 8.
Ride safe..looking forward to your next post.