Rollers on top and bottom?

A quick learner from Ann Arbor, Michigan says:
These rollers look exactly like the ones on my sliding screen doors. I notice that there's a suggestion to replace both sets from the bottom when changing one (which makes sense.)

It also suggests that doors usually have two sets on the bottom, but doesn't mention the top. My doors have two on the bottom and two on the top. Is this typical? Should I swap out all four?
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Donna from SWISCO responded:
Sometimes there are also rollers at the top, however, they tend not to get as much wear as the lower rollers so you may not need to replace them. Pull the door out and get a good look at them to make a decision.

When it come to the lower rollers, yes, definitely swap both out for new rollers at the same time.
A professional from California says:
They don't bear weight, but if they squeak and grind, I would replace them. Top rollers like this are more important on narrow doors that may tilt and jam into the top frame than wide doors that tend to sit more firmly in the track. You may be able to get away with removing the top rollers. Some top rollers can be lowered into the top rail. These cannot. For only a little extra money, I would get them. The amount of work for 4 is not much more than 2.
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