All RVs are basically boxes of air. Nothing to them. They have a huge amount of windage. Travelling in still air at 60mph is no problem however if a 60mph gust of wind hits them broadside then there is a huge problem.
There is not much one can do to make the RV more stable. Be aware of weight & where it is. Lots of RVs are far from balanced with all kinds of heavy stuff on one side & light on the other. About the only thing that can be done on windy days is to travel with the water tank full. The more weight down low the better. Best to get off & stay off the road till the wind drops.
Wind warning signs are not always lit. We drive along, windows rolled up, oblivious to what is going on outside, especially on the open lands of the western states.
Some 5ers tow so well that there is no sign of exceeding limits till it is too late. Happened to us in 2009 on I80, WY, Elk Mtn. Got caught in a huge sustained gust broadside & over the 5er went. Tore itself right out of the hitch & rolled down a 50' embankment. Totalled.
I maintain that the extra stability of the dually saved our backsides that day. The truck stayed upright & on the highway shoulder.