pressurize ute back

mount vents on the front of your canopy, or if possible with yours ontop. Something like the small flip open caravan vents ontop would work. Otherwise if on front, make sure they can be closed for rain etc.

When I had my canvas canopy, I had two vents in the front. Still got some minimal dust ingress, but nothing compared to that when I had them closed. Dust entering the vent was only really a problem when following others.

Good luck

we travelled like that for years..canvass back on a tray top

two inlets in the front (one either side) roughly 150mm square. sown in mesh guard and a flap that secures firmly (clip not velcro) down from the top for wet weather

works a treat..you will get a very mild dust ingression around the tail gate area..that will settle around inside...but very very little..nothing you cant live with..really it has never been an issue with us in many thousands km's of dusty travel over many years

Drive down a few dusty roads and find out.
You may not have a problem.
I was surprised with my canvas sided camp trailer when I first got it... barely any dust, but not sealed all that well.

Anyway... the dust is all part of the fun!

Go down to your local boat store, and get some of those deck vents.
They allow air to come in, but have a water seperator as part of their design, so you can use them in the rain, and no water gets into the canopy, only down side is that there a bit taller than the smaller pop up vents.

Still great idea tho.

Trains