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I'm 99% sure it is just the M915 series, which includes the M915+A's,M916,M917,M918,M919 and M920.
M915,M916,M920 are tractors
M917 is a dump truck
M918 is Bitumus (tar)tanker
M919 is a cement mixing truck, think cement plant on wheels, not the every day mixer. Real cool some one on here has one.