2011 was the first of gen 5 duramax lml. the first year for def and cp4 fuel pump on duramax trucks. Also more horsepower torque and stronger frame for higher towing numbers. Yes there were some issues with some trucks have def heater issues and some cp4 pumps Grenaded taking fuel system at 10g plus to repair. I would buy that truck but only with a very good extended warranty. I’d say the same about the same year ford powerstroke.
Being Your from Minnesota, my biggest concern would be rust. This trucks tend to get it bad rusting from the backside of the steel and then out right above the wheel wells.