Yes, the truck creates a vacuume as it passes pushing the air out of its way then creates a vortex in it wake also disturbing the air after wards causing what you are feeling.
Here is a video By airtab that explaines the what happens when a truck passes.
No amount of air pressure changes or suspension mods will get rid of this totally but I have seen where
Air Tabs worked to make it much better.
We used them on our trucks to be a bit more fuel efficient and handle better,which they did.
I have noticed when passed by a large vehicle that have some kind of vortex generators or good aerodynamics the buffeting is not as severe.