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A partial grill block would help.
Partial or full belly pan.
In lieu of a tonneau cover you could increase the top surface of the tailgate.
Pay attention starting around the 1:40 mark.
Here’s a aftermarket spoiler for a Ford to give you an idea.
https://www.autoware.com.au/shop/for...lgate-spoiler/
I didn’t see one for a Taco. But you could make one fairly easy.
Oh and extra brake pad return springs. Toyota normally has OEM springs but a extra set won’t hurt.
(brake drag)
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