Class A or trailer, either one is affected by wind. Some more than others. The 5er is still a big box with lots of windage.
We lost our first one to a blowover. Broadside random huge sustained gust of wind coming down a mountain valley. The trailer was torn right out of the back of the truck & down an embankment. The truck stayed upright. Trailer totalled.
Had we been driving a class A at the time I think it would have gone over. Yes the wind was that strong.
Suggestion, if driving in wind, travel with a full watertank to lower center of gravity. The DRV can carry 100gal. That is an additional near 900# down at wheel level.