[gumby79]

I like how they plumbed the energized air from cooling system into the wake reducing the vacuum on the back side of the car creating a box cavity.
I could do similer with the dodge except draw the air from under the cab through the front bulkhead. Drop the tailgate lose the bumper add a diffuser from the differential to the end of the tailgate should work pretty sweet what do you think? Add a Bonneville spoiler :
2019 SCTA Rule book pg 60-61.
This would close off all but 3" of the sides , vertical , creating a nice box cavity. For street use add a pic of lexan formed to the bed side out to the end plate. (Inside sidewall width limmit)