Winds can definitely disrupt an otherwise stable towing combination. Between my F350 and 26 foot trailer, it's rock-solid 95% of the time, but we hit a nasty wind storm in Salt Lake City a month ago that closed down I-15 to high profile vehicles. Winds were blowing 40-50 mph with 80 mph gusts off the mountain range east of SLC.
In order to detour around the closure, we had to head east, towards the worst of it, and then south on surface streets, which meant we were taking the brunt of the storm as crosswinds. Even driving at 30 mph the gusts were blowing my rig a lane over. My friend that was in front of me has a smaller Lance and F150 and I saw a gust push so hard against their trailer it came very close to lifting a wheel off the ground. If the slide hadn't been on the windward side, I'm pretty sure it would have gone over. In all the years towing in snow, ice, and rain, that was the most white-knuckled 40 miles I have ever driven.
