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Halysidota tessellaris
Grey soft fuzzy with long black hair "antanna". Looks like a Persian kitty caterpillar. Lol
Trees? I keep finding them on my truck.
If you submit this to BugGuide.net, they could also help with a definitive ID. Very nice!
While it does have some similarities to the American Dagger Moth caterpillar, this caterpillar does have more long tufts and of different colors and slightly different arrangement.
Nice spotting!