Check out 379 Conventional Semi Truck 3D model on CGTrader for $39. High-quality mesh by aRLaN6: 224385 polys, 213377 vertices. Textured.
OBJ (OBJ, filesize: 11.3 MB), 3DS (3D Studio, filesize: 3.47 MB), MAX (Autodesk 3ds Max, filesize: 5.14 MB), FBX (Autodesk FBX, filesize: 22.9 MB)