Sliding door motor shaft support

Have you ran the sliding door motor with or without support for the shaft in the past? If so, approximately how much tension was on it (or just tell me the size of the sprocket and I can figure it out). Thanks.

We ran it supported only by one side in 2003. I believe we had a 3" drum that we attached to the shaft to wind a cable around

supported on one side meaning no supports in addition to the motor gearbox itself?