From researching on other forums (non-GMC truck related before I found this forum) I think I've narrowed it down to being a '55 450 grain/dump truck. It's been sitting there for a while, got trees all around it. Here's a link to the thread I started on it, pictures included.

https://www.stovebolt.com/ubbthreads/ubbthreads.php?ubb=showflat&Number=631290#Post631290

Thanks for the welcome!

Last edited by SS FatMan; 03/23/2010 12:39 AM.