Hi guys, this is my truck camper.
https://photos.app.goo.gl/LDVGwoF1CFGhidXc9
This is the before photo, with air not directed into the radiator, which is tucked up inside the engine bay. There are steering rod linkages and pipes in front of the radiator. most air goes under the truck, bypassing the radiator.
https://photos.app.goo.gl/Tbq41HHXEuN5AGFz6
My first attempt at a undertray, in plastic
https://photos.app.goo.gl/9JQ2zBZnrNSmFFqf7