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Dodge / Chevy
The 1st gen S-10/GMC S-15 was Cd 0.475 and with mild streamlining (Gale Banks Syclone ) got down to Cd 0.315 which was lower than a Corvette at the time.
Your grandad's S-10,in 2WD configuration is Cd 0.42,a much cleaner starting point.
If this lower drag,smaller frontal area,lighter truck can handle your hauling and pulling duties,then it would have better 'beginning' parametrics than the Dodge.
With a comprehensive streamlining package you could drop below Cd 0.2.
This would get you easily above 30 mpg,based on early powertrains.
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