Truss tubes with a shroud fitted, even if stretched tight will get buffeted more than a solid round tube with continuous curve.
The additional weight of a solld wall tube will also help.
If dirt is blown around, even at ground level, mirror surfaces are much more protected.
This is something I have a lot of personal experience with. Our place in the high desert is in pass in the coastal range between the desert and the ocean. It is very often quite windy. I consider 10mph or under, calm, 10mph-20mph, typical, over 20 mph, windy, over 30mph, probably time for a haul out a shorter scope or hang it up.
First rule: No shroud, A shroud is just a big sail that catches the wind. You see my photos of my desert Dobs, no shrouds.. A tube also dramatically increases the surface area.
with the 25 inch F/5, the scope wasn't the limiting factor, the limiting factor was my body buffeting in the wind on the ladder. The scope was stable but I was not. Same with the 22 inch.
Dust: It's dry, very dry but it's basically a sandy hard pack. Dust is generally stirred up by ones feet and not the wind, it blows too much for there it be dust, it's all blown away. A tube protects when one is storing the scope, covers do that too, but I don't worry about it when I am using the scope. And mirrors are easy to clean.
In a windy situation, I will take an open truss over a full tube scope every time.