Cd 0.259 Chev. Sierra/Silverado El Camino
 

If General Motors devolved to 1987,with a 2013 spin on passenger car-derived pickups,the Holden VF Commodore Ute body could be inflated to the dimensions of the GMC/Chevrolet twins,Sierra and Silverado,as a unibody platform,doing away with the cab-to-bed gap,and with an aftermarket 1980's GM aeroshell,attain Cd 0.259,giving Tesla a run for their money.This is with mirrors.
America's first production pickup truck was based on the Ford Model-T passenger car, around 1909.Why pickup trucks ever strayed from the passenger car silhouette remains a great modern day mystery.

Step-side, fleetside, long/short box, utility bed, flatbed, wrecker, water tank. I'm probably missing some.

https://ccpublic.blob.core.windows.n...no-thumb-c.jpg
https://ccpublic.blob.core.windows.n...no-thumb-c.jpg

I'd prefer the 1968. This example is minus the optional stainless steel rocker trim.

straying
 

I get the part about the bed,but the front end is an enigma for me.Unless it's just a Paris Dressmaker thing.

Part of it is my parents had a 1968 Chevelle SS396 convertible. They traded in a Rambler station wagon when the last of the kids left home. :)

Better?
https://i.pinimg.com/736x/c1/f5/63/c...1ff7ab5c81.jpg
https://i.pinimg.com/736x/c1/f5/63/c...1ff7ab5c81.jpg

I suspect the 68-87 front end is a wash, but the earlier one has a deeper C-pillar. The Faschenfled edge on the '87 may have an advantage.

They lived until 2017 downunder
https://s1.cdn.autoevolution.com/ima...Ute-5910_8.jpg

Also funny the latest C8 vette with it's mid engine started out as a Holden Ute.
https://carsguide-res.cloudinary.com...e-1001x565.jpg

When I was lucky enough to make a port call in Tasmania the local car club invited us to their meeting and a tour of the island. One of the guys had a 1956 Plymouth Savoy Ute this model. It was uniquely aussie and cool but I liked the 1963 Galaxy 500 convertible as better tour car for a sunny cruise.
https://i.pinimg.com/originals/8b/29...732f4e3538.jpg

When I was in college I had a 1953 Plymouth convertible. (about the same time my parents had the Chevelle). It had that same body.

I think Chrysler Australia ran car lines much longer than they did in the US. I suppose it's even possible they didn't get their "new" models until the tooling was no longer used in the US plants, and they sent the whole stamping forms over there. I don't know that for sure but it makes sense. Especially back in the 50's where it seems they sometimes would change things up every couple years.

here is a pic labeled 1956 Savoy ute.
https://commons.wikimedia.org/wiki/F...279722404).jpg

down under
 

Lowest-ever drag coefficient for a production 'pickup.'Weird that GM imported the Holden passenger car designs for Pontiac,but never considered it for a Chevy/GMC pickup.Pity.