Todd
We have had hundreds of customers fit their AutoHome tents to Camper shells. I have one mounted on an ARE shell on my F350. I recommend that you use a set of mounting tracks from Yakima or Thule, set two (or three) crossbars and mount your Columbus to that . If you need further advise, call us at 888-852-2359 and we'll see if we can help further.
MIke