[EricH]

What effect would a cantilevered load have on all of the above tests? (i.e., a mecanum robot with an arm extended it with a load) Anyone thinking about using an arm with mecanum wheels would probably want to know that.

Also, would the effect change if the arm was off the side for some reason?

I don't think it would be too hard to test this--a 5-10 lb known weight at a known distance from the frame, bolted on, should work easily.