Those are for the fork lift, so the junk yard can move it around easier. These are the biggest POS gm has ever sold to the public
Funny you say that as I've been tossing around trading my Ram 2500 in for a new GMC 1500 with the 3.0 Duramax as my wife wants us to have truck that's easier for her to drive.
I got the Ram used/CPO for a good price last summer and traded in a 2015 GMC 2500 that was climbing in mileage and also had some fucked up electric issues the first couple of years I owned it.
I don't tow much but when I do it's nice to have power and stability. This load was working the 6.7 on the hills the other day. I have a feeling it would have been a lot more stressful on a 1500.
And the only issue I've heard with this generation 6.7 Cummins is the CP4 IP which a few companies have solved with a CP3 conversion for around $3k.