I work (on a high school team) with Solar Bikes. They are normal road bikes with hub motors/solar panels/batteries. We need to get a work stand that can handle these. I have not been able to find any useful weight limits for work stands available.
Our bikes weigh around 70-80lbs with everything in, and the weight can be dramatically reduced by removing the batteries. (not sure how much)
Even without the batteries, there is the hub motor and solar panels
(just to give you an idea, we're using various iterations of the Cannondale Caad series, with our newest bike being a Caad 8)
So if there are any stands you know can take a lot of weight, we would be glad to know about them.