I spoke with the lead tech at the dealer I purchased my 2015 Sierra 1500 Denali from and let him know that I wanted the level kit for the front and what I've read here on the forums regarding issues with the magnetic ride suspension and level kits.. He told me that they have done this on over 30 trucks with mag ride and its a simple process of recalibrating the sensors to compensate for the level kit. No relocation of sensors needed, just a recalibration which would cost me an extra half hour of labor.
Hope this helps.