I pulled the third row seats from my 2010 Yukon as soon as I bought it (in 2013). I put in a plush carpet remnant and it has been fine for my purposes. We travel months at a time with a travel trailer, and keep some tools back there plus camping stuff: folding chairs and table, solar panel, water softener, ladder.... One thing I have done it to cut a slit in the carpet near one seat bracket. I have a heavy wire that runs between two brackets, with a ring on it. I pull the ring through the slit, and then use that as a tie down point.
I am seriously considering getting a new Yukon. I understand these have non-removable third row seats. But I own some wrenches, so the seats won't last long. But I don't know what it will take to trim out the floor afterwards.