Weight capacity of 81-182

A quick learner says:
Looking for stainless rollers for a heavy duty sliding spa cover in track.
Can you tell me the weight capacity of thes?
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Tom from SWISCO responded:

We sure can. The weight capacity of the 81-182 is 84 pounds per assembly. Let me know if you have any other questions!

A quick learner from Utah says:
Do you know if any that can carry 400 lbs?
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Tom from SWISCO responded:

Are you looking for a roller with a weight capacity of 400 pounds, or is the door itself 400 pounds supported by multiple rollers? That distinction will make a huge difference. I can tell you right now that there probably isn't a single roller around that can carry 400 pounds. Even splitting that weight between two rollers, each with a capacity of 200 pounds, is a lot, but it may be something we can look into. Can you clarify?

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