Thanks for the idea re thrust angle. The wheel/RV doesn't pull and this wear pattern didn't show up till 45,000 and the second set of steer tires so I'm guessing that's not the issue.
For the moment, I'm leaning toward the wear being caused by fighting heavy side winds for over two days.
I discovered this just before leaving for a Key West trip, so I just swapped the front tires. Didn't think that was an issue on non-directional tires. When I get back, I'll have a shop dismount the worn tire, and put the worn area on the inside. And leave that tires on the driver's side.
Then I'll closely watch wear on both tires.
The rears are a different brand, so I'm a little reluctant to mix them on the rear.