"2 Retired"......Many have an issue with driving in the wind. That constant fear of being pushed off the road or into another vehicle worries a lot of people. Even though people worry about it, it rarely happens.
The bigger issue is how it wears you down. You drive with a death grip on the wheel and soon your body aches from being so tense for so long. Everyone is different and so is every rig. Some rigs don't even feel the wind while others get pushed around. Only you can decide how much you can tolerate.
We recently went on a trip with another couple who drive a coach that doesn't do well in the wind, while mine is rock steady. We did a 500 mile day and it really tore up his bad shoulder. On the return trip we cut a large segment out of the drive, spreading it over two days. We typically don't do long drives in retirement, but needed to during this trip.
When it's windy, shorten your day and make more stops so your husband can get out and walk around. Have him do a little stretching and release some of that tension from the drive.