Awesome!!!! You Nailed It!!! (or is that glue and screws? hahaha!) You have really built something that is as close to optimized as I have ever seen built. You should get very close to the best Cd you can achieve with a cap, but you have nailed getting the best C
L. Your truck is going to feel like yer driving an arrow down the road. If your travels take you to snowy places, you'll really appreciate the stability.
How may I ask did you figure this out???
Great Job!!!