IdaSHO
IDACAMPER
If you have RAM truck from 2010-2018, I'd recommend this: https://www.genosgarage.com/product/cff-dg-19009k/interior-replacement-parts
This simple item removed all of the diesel and other smells from the air in my truck. The fan does work a little harder, but the truck stays pretty dust free. I bought a few extra replacement filters as well and I've replaced them once in 12k miles or so.
Ive seen similar for this truck, but its a big no-go for winter travel.
A but of moisture and freeze, and you will have zero airflow to the air box.