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Jeff, After talking with you it occurred to me that if you were on an incline the trans may have tried to shift to a lower gear without fully dsengaging from the higher gear. That would certainly cause friction!

Thanks again for all the suggestion's while we were on the side of the road .
Found an Allison dealer in Cut Bank, Mt who is confirming transmission issue.
Got Cliff's towing to load the Coach on his flat bed trailer and haul her 90 miles to the repair dealer.
I drove the Coach on the tilt trailer no problem in reverse.
When I drove off the trailer at repair center forward at 30 degree angle with the engine running and trans in gear  she would barely roll. As soon as turned engine off she rolled right off with gravity, confirming transmission  locked up.
Looks like the Coach will be here for a week or 2 waiting on the rebuild.
Thanks
Jeff