Covered cars pack is excellent props package for your maps.
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This package contains:
6 well-optimized car models.
each of which contains three LODs (1000\500\200) and collision collider.
Three sets of high quality (4k) PBR textures for each. (diffuse, specular_gloss, normal, AO)
18 preconfigured and prepared to work prefabs.
also included the test scene.