Keep’em coming! 🙂 I wouldn’t say there is a specific MPH of wind to look out for, as each motorized or towable camper will be different, the comfort levels and experience of the driver will be different, the unpredictability of winds, and so on.
That said, there are specific measures you can take if you find yourself caught in strong winds, like slowing down to give yourself more control, steady steering (proper countersteering and preventing oversteering), and knowing when to pull over and wait for the winds to die down.
Hope that helps.