I have a 2009 Tahoe that is my daily. 226k miles and will serve me with many more. It is a 2WD truck that is lowered, so a different use case, but I think the 2010-2014 4WD trucks with the 6 speed are the last relatively simple, reliable Tahoes. You've already noted the disabling the AFM, which is the one large weakness until dealt with. If it is a well-maintained truck that's clean, I think they can provide hundreds of thousands of miles of relatively cheap usage. the coilover-style front end lends itself well to a modest level and 33's pretty easily through a Bilstein setup or similar.