Check out Snowcat bulldozer 3D model on CGTrader for $69. High-quality mesh by NoneCG: 143223 polys, 170363 vertices. Textured, UV Mapped.
MAX (Autodesk 3ds Max, filesize: 8.7 MB), OBJ (OBJ, filesize: 3.36 MB), FBX (Autodesk FBX, filesize: 3.05 MB), MAX (Autodesk 3ds Max, filesize: 8.7 MB), C4D (Cinema 4D, filesize: 1000 KB), MA (Autodesk Maya, filesize: 2.78 MB), HRC (Autodesk Softimage, filesize: 1.73 MB), COB (trueSpace, filesize: 1.73 MB), LWO (Lightwave, filesize: 1.15 MB), 3DS (3D Studio, filesize: 1010 KB), TEXTURES (Textures, filesize: 681 KB)