Final followup...
Sun was shining enough today to make it bearable to work outside. I got the furnace back into the coach today. Surprisingly things went pretty well, and other than a bit of frustration trying to get all the ducts and intake/exhaust lined up there were no problems. LP connections did not produce any bubbles on the leak test. The fan kicked on both with 12v and 120v, and it stayed on after the burn until things cooled down. The burner had a nearly pure blue flame, and the pilot looked good. Thermostat seems to do its job. Best part was that the CO monitor read "0" the entire time I was conducting tests. Got the panel in the wardrobe above the furnace put back in, and was even able to staple down a nice piece of carpet to replace the one that was sacrificed in order to get the panel removed.
Best part?? The furnace warms the coach nicely and runs quietly.
Total cost for the repair was $100 for the motor and another $25 for the replacement crossover tube.
Unless I'm missing something, I think that I'll classify this as a successful project.