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Thanks, Aerohead! I didn't see indication of a roof camber to be included into aft-body ration in the SAE 810185 but now when you mentioned, it makes sense.
Without roof camber :
* L0 / L -ratio of 0.3441 (without a tail extension)
* L0 / L of 0.4087 (with the tail extension)
With roof camber:
* L0 / L -ratio of 0.5234 (without the tail extension)
* L0 / L of 0.5704 (with the tail extension)
According the SAE 810185, it implies that larger aft-body ratios has chance achieving lower drag coefficients.
I have a sideview profile of the truck roof (from the windshield to the rear window) which then continues to the end of the bed and beyond. The roof peak seemed to be fairly front of the cabin (towards windshield) which increases the aft-body ratios. I have a cardboard template from the top of the windshield all the way down to the end of the bed and beyond where I fitted the sideview profile.
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