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Those things back then had the engine way in the back under that rear hump
Interesting.  All the models I have ever seen had the engine in front. Never saw a rear engine version myself. 
I HAVE heard of twin engine models that have powerplants in both the front and back (push-pull scrapers), but have never seen one....Maybe that's what you saw. 
I did mislabel my vehicle though.  These are actually called "Scrapers", or sometimes "Earth Movers".


THIS is a true road grader...Guess I was more sleepy then I thought last night when I named it.  Ah well...I don't think anyone will mind.

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...this thing is just dying for black with flames, a big blower motor back there, some custom wheels... 
Make one heck of a monster truck, eh?   I once saw a parked car that had accidentally been crushed by one, and I swear it wasn't any taller than 6-8 inches!  Bigfoot, eat yer heart out!