I am a peterbilt guy dont know much about Western Stars. Truck i am looking at is a 2013 4900ex. Did they make a low max in this year? Truck sure seems to have the low look like the older low maxes I have seen. Factory 600hp cummins, 46 rears, 12,500 front, 18 speed, flat top bunk. Anything to watch out for as far as issues on this truck? Thanks in advance.