This entire conversation is funny to read to me because I work as a mechanical engineer and design machinery for a living. And I've used electric motors all the way up to the 3,000 - 4000 HP range... And gear systems up to 30,000RPM's...
So the theories everyone has about rotational forces loosening lug nuts and all the other opinions are a good read.
Do you know how many times I've saw a need to use Left Hand Thread with hole pattern centered around the rotating axis for any reason? None
The only time I have saw a need to use Left Hand Threads is when there is just one bolt holding something on mounted on center of the rotating axis and the direction of rotation. Like a bike pedal. Or if you want to turn say a turnbuckle and want something to expand and contract between two points.
