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Top picture, the Chevy chassis, is exactly what you have? Looks like there is already a pretty good airdam there.
What was the old motorhome? What are the two engines and transmissions? You should plug both of them into the Aerodynamic & rolling resistance, power & fuel consumption calculator, in the Tools section, and see if the differences agree with your observed MPG. You could then tweak your current setup in the tool and see what gains you can make.
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