Just to let everyone know - using the two motors in tandem worked out far better than we ever expected.
In brake mode, they both stop almost instantly when power is cut. We tested without the chain off and saw more of a difference in free speed that was listed in the specs (hmm....) but on the chain together they both run well and neither is heating up. We've been checking the window motor for any gear issues and I'm happy to say it is not getting torn up either.
Oh, and Al, we have a 100 lb gas shock to assist the lifting. The problem was our overall speed was just too slow with a single motor. This fixed it beautifully.
We went through the Detroit regional without an issue related to the dual motor drive on the arm. Though the increased speed did wear out the key we used on the arm shaft
