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It all depends on what your pulling and what the level tongue height is.
Thanks guys for all the info. I was just surprised when I used the receiver from my 2008 Sierra Crew Cab and put it on the 2015 Yukon. There was a big difference in the height of the hitch. I think the 5 1/4" will do but when I get some free time will have to hook it up and put it level ground to see if it is ok.