IMHO 40mph gusts are no big deal. Sustained with higher gusts (60mph or higher) are better to go slow or stop for a break while it passes.
Of course that also depends on the truck and camper setup you have. If you are already borderline on capacities and length, etc, it might be better to sit it out.
The more margin you have in your setup, the better your rig will handle it when your entire setup is "pushed around". Just be aware that above 40mph and at 60mph+ you are getting into "tip it off the wheels" territory, independent of your towing vehicle.
Of course, this is all subjective based on your setup, rig size, comfort level, etc. It's what WE would do, but if you aren't comfortable, have an extended lunch break and enjoy the scenery while waiting it out ๐