dumper (sketchyphysics) Free 3D model

This 3D model was originally created with Sketchup 13 and then converted to all other 3D formats. Native format is .skp 3dsmax scene is 3ds Max 2016 version, rendered with Vray 3.00 Very simly. Anyone idea how to handle steering wheel which contoll two paralell wheel of this truck? ( just want to rotate them parallel, at same time ) sketchyphysics 3