I am not quite sure of the model# but the one that I have has a suction cup apparatus, in addition to the magnetic base, that can be used on the back of my AS when backing into a site. i believe that the only difference in the SHO 1 and 2 was the length of time between battery charges. I'm too lazy to go out to the AS to check out which model i have.
Keep the dirty side down,
2015 GMC Denali 2500, 4x4, Duramax diesel, Topper, Pro Pride 3 P, Sendel 16" with Michelin LTs, one Yellow Labrador Retriever (AS security)