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sounds like the overheat switch, maybe.
fan on says thermostat calling for heat. that's OK. typical of old style controller boards to leave fan on as long as thermostat is calling for heat, no matter the burner status.
furnace wouldn't fire if sail switch wasn't working
but 10 sec before flame-off is rather short for most overheat switch problems. That safety usually gets worked when duct air flow is too low to remove furnace heat. Poor duct flow seems to be almost a norm in a lot of trailers.
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