ITC ceiling LED fixtures - dimmable?

We recently took delivery of a Winnebago Sunstar, which includes LED ceiling lights. I am told they are made from ITC and the bulbs themselves are not replaceable, only the fixture. They are a bit bright for my taste, but I did find a dimmable wall switch (on order at this point). But I have no idea if these ITC fixtures are dimmable.

Anyone have experience in dimming these? Thanks.