Willys T3 Trailer 3D model is available on CGTrader for $55. Original author: Plutonius3d. Specs: 63256 polys, 33418 verts.
STL (Stereolithography, filesize: 1.44 MB), OBJ (OBJ, filesize: 3.32 MB), MAX (Autodesk 3ds Max, filesize: 3.13 MB), 3DS (3D Studio, filesize: 1.15 MB), FBX (Autodesk FBX, filesize: 3.03 MB), UNITYPACKAGE (Unity 3D, filesize: 3.03 MB)