I too installed the AMP steps on my 2016 1500 Laramie Longhorn - though I went for the extreme version (two motors per side) - Yes the Extreme fit and function on the 1500 some say they don't. I chose the dual motors cause I wanted to ensure IF one motor malfunctioned there is still a functioning motor and the malfunctioned one I could turn into a ***** if needed. As posted here they are awesome and function extremely well.
As for the OBD2 - AMP sells splitter on their website or you can just unplug the AMP when making changes with Alpha
I also installed the override switch and would highly recommend this - I was able to install/hide it in the centre console.