Josh thanks for getting this going.... should be alot of fun. Just to be fair and helpful to those guessing I will put a picture of Big Rig from behind that we had taken when we had him down. From the front you can not see he has--- I guess you would say another beam on each side that has points and also the points growing out the back. So I hope it helps!
If anyone whats to change their guesses they can after looking at the rea shot.