Mod '87-'06 Gavril Durham r1.0 for BeamNG.drive

Quick summary: This is the Gavril Durham, my first big vehicle project. Design wise, it is heavily based on the General Motors medium duty trucks. Jbeam wise, it uses the van frame and axles as a basis and has grown up from there since, and the cab is off of the D-series with minimal modifications. Keep in mind that this mod does have some issues (frames bending weirdly, some meshes being incomplete around the wheel well, inside of hood is really blank), I'll try to fix these as time goes on