Steve and Mike:
I installed a new starter solenoid, and solenoid diode, along with chassis batteries. The coach is now starting great. It turned out that a cell was bad in each chassis battery. Steve's earlier post about a potential battery issue was on target.
Seems that the batteries were most likely the starting issue I had experienced upon departure from Breckenridge , CO for the drive back to my Michigan home base. What threw me off was the coached started just fine at fuel stops and even after a seven hour sleep stop at Cabelas parking lot in Nebraska. So, I did not consider batteries as the issue and went directly to replacing the starter solenoid.
Fortunately, today, I was able to move the coach into the barn for the winter; unfortunately, I will not be on the road again until after the Spring snow melt.
Thanks again for your help and advisement on my starting issue.
Randy