"RV'ers" is a pretty broad category - with towables being a whole different ball game than some motorhomes.
We have traveled in very high sidewinds in our motorhome and felt stable - but unlike a towable, our 101 inch wide and short coach RV is built on a truck chassis (Ford E450) with it's very wide stance duals in the rear -> about the dually tire width of a big rig semi. However, unlike both a towable RV's heavy components and the heavy cargo sitting on the floor in a big rig's trailer (that sits above it's tires), our motorhome coach's heaviest components are mounted right down beside the frame's siderails - actually below the top of the tires - in addition to the low down and heavy engine, transmission, and drivetrain helping to anchor the coach down.
Our coach's built-in generator, propane tank, 55 gallon fuel tank, black water tank, grey water tank, large twin batteries, and almost all exterior storage cabinets are about at frame rail height. This makes for a reasonably low and stable center of gravity for the RV.
However, some modern motorhome RV's are still kindof tall, but built on the new narrower track width delivery truck chassis like the Sprinter van and new Ford van. These I would be concerned with in high sidewinds - right along with TT's and 5th wheels.