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I had a 2015 and the dealer was able to change the lower limit to 45lbs so I didnt have to ride around with 70lbs when not towing. I just bought a 2019 Denali and asked the dealer to do the same thing before I took delivery. I was told it can no longer be done on these trucks. Is this true? Thanks
 

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It can be done. I believe there are aftermarket programmers that allow you to do it or you can get a subscription to the ACDelco programming software (you will also need an OBII interface). I went with the second option and also updated all the other modules in truck that needed updating.
 

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I would call another dealership. Pretty sure it can be done on the 19s. Was told the same thing on my 16 when i went up there until I told the service guy to go talk to his tech in the back.
 
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