I’m just getting started with my 2011 GMC Sierra 3500 SLT LML Duramax crew cab that is also known as Maximus. Modifications so far include an EFILive tune by Idaho Rob, Edge CTS gauges and a custom stereo system with Boston SPZ door speakers with 500-watt amp, two 12-inch Pioneer ib flats under rear seat with a 1500 watt amp. I also added a BMW gooseneck hitch, Firestone airbags on the rear for towing that include an onboard compressor, plus 6k HIDs headlights and fog lights.
I'm 17 and this is my second diesel. I had a 1991 first generation Cummins, but my LML has a lot more power. I use Maximus for towing my 43-foot Exiss Living Quarters horse trailer loaded with four horses every week, plus to the sand drags once a month.