It depends if your are protecting components or building rock sliders. You should be able to fabricate full belly sliders that are very aero. Just remember to make them removable for maintenance. Our newest Jeep Cherokees at work are very aero underneath but they do not protect anything just aero plastic panels.
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02 Saturn L200 5 speed- 265k miles
84 Gmc 6.5 na diesel K30 4x4, TMU
2006 Lincoln Navigator, 215k miles
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