How much wind is dangerous?

We've driven across Western Kansas with a steady 35 mph crosswind with 45 mph gusts. Our trailer is fairly low slung as well has a tad heavier than some, and our tow rig is heavy too, and even though we didn't get pushed around much at all, beyond those wind speeds I would pull over. There are plenty of other people on the road, and often the wind diminishes after sunset.