So I've been on and off this thread more than a few times hoping for answers on the dust issue. Finally bit the bullet and pulled the back seats out of the truck, removed the cover on the back of the cab, and thoroughly investigated this miserable dust issue. I found the pressure vents on the back were working well enough and weren't nearly as dirty as I was expecting. Under the carpet, however, was caked in layers of fine dust. Could have grown a plant it was so thick. Pulled back the carpet to find extra bolt holes (for different seat designs, I'm assuming) that were empty. No caulk, no bolt to cover it, no plastic cap. It is clear the dust comes pouring in through these 3 holes, as there are spots on the bottom side of the carpet where the dust caked into it. This is a 2022 1500 Laramie Crew Can, so perhaps the Limiteds didn't have this issue because those additional bolt holes were used for the fancier seats. Anyways, I filled the holes with caulk, covered them with Gorilla 100mph tape, and covered the rear pressure vents with HEPA filters from Amazon (caulked around those as well). Will see if this fixes the dust issue.