Ed, you are correct on the 3/8 rod leaving marks where the screws for the forks contact it but it does not bother me and it does not rust. I cannot comment on the Weber rod as mine is a model 9891 which does not have traditional forks and I have only used it once. The rod I use with the Weber motor is a generic plated one ( Wal-Mart I think) and the plating is coming off where the forks screw on and it will rust now if I don’t keep it oiled and dry but I do store it outside in the gazebo. Ed, sounds like you have not had this issue with the Weber so that is good to know.
When I get my 3000 finished in the spring I want to spin as big a turkey as I can fit on it and wanted the heavier motor of the OneGrill. The Weber is more than adequate for most people. My coworker has a Napoleon and it will not even spin a 12 lb turkey so check the wattage on the motor on whatever you buy. And if you buy an older used Weber one, open it and check that the grease is not dried out and hard. If it is, clean it out and add new grease and you will be good to go.
Richard, I have never had a problem with any motor not having enough torque, but in all honesty and being conservative the largest load I have ever tried to spin is maybe 18lbs or thereabouts. These split-phase motors are inherently weak in starting torque and have very large gear ratios to make up for it, and as you say something like dried out grease or even cold weather can be enough to keep them from working. I always try to balance the load without a counterweight because I have never been able to counterbalance properly and you are working against yourself by adding weight, and I have had problems with the Weber kettle counterweight clamping system holding the counterweight tight enough to prevent slipping throughout a cook. The problems I have had in the past have been that the motor refuses to turn from the get-go, without the spit rod or the load.
I have not used the battery operated motor other than to try it to make sure it worked when I first bought it. It is very noisy compared to my other motors. My go-to motor is a SS-enclosed DAI JIA Industrial Co., LTD, Model DJ302, 60Hz 115V 15W, CSA NO. 222994, bought a very long time ago on eBay. I have taken it apart at least once that I remember, but now I have a couple of alternatives if it refuses to start. Maybe the grease and cold weather combine to create an issue up north? I have never had a problem during a cook, only at the start.
My go-to:
The never-used OneGrill battery powered motor, the noisy one, claiming to be 25# capacity:
Note the plastic battery cover:
And the Weber, quietest of the bunch, also never-used (by me), picked up with a donor grill:
The JoeTisserie motor has gone missing but probably outside with the BGE and of little interest in this discussion.