Early on, I was always looking for a way to support the sled while working on it. I never liked keeping it attached to the motor chains while I worked on it.
So, I used an extra piece of dowel, drilled a hole at the center/top of the spoil board (the same size as the dowel), and I use a clamp to keep the sled weight off the chains. The dowel is easily removed during operation. Made another hole in the frame to hold the dowel during operation.
While I have never had issues with the gears in my motors (knock on wood,) I keep the sled weight off the motors except during use.