Here is a link you can get a little more info:Is the only difference the height? I’m planning on installing fishing pole tube holders - so, was already worried about ground clearance.
https://www.etrailer.com/question-80046.html
Main Diff:
The # C18153 is slightly larger at 24 x 60 than the other which is 20 x 60-inches. It also has an angled shank to provide 2-inches more ground clearance at the rear of the carrier. The # C18153 also provides more clearance from the hitch pin hole on your receiver: 9-inches when folded up and 19-inches when in the down position, as compared to 6- and 16-1/2-inches for the # C18151. The # C18153, due to its larger size, also extends out from the rear of your Expedition a bit further: 44-1/4-inches versus 37-1/2inches.
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