Thinking about how truck nuts evolutionarily should lead to more external sexual dimorphism in trucks (maybe this started with gun racks), eventually leading to a ceratopsian style diversity in truck crests and colors.
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truck anatomy
@Leucrotta racks in the back of the braincase, tusks on the front ends of the jaws, longer legs and greater splay distances, wider feet, rare metallic materials they've ingested extruded onto their outward-facing footparts as protective and mate-attracting features, coatings inside their mouths to handle more toxic environments as displays of their prowess, extensions through the roof of their mouth to breathe better following maladaptive evolutionary changes
