For 2003-2006 models having a 50/50 3rd row bench, the tether anchor for 3C could be used instead for 3P – but never for 2 car seats at one time!
For 2007-2014 models having a 50/50 3rd row bench, the tether anchor for 3C could be used instead for 3D – but never for 2 car seats at one time!
2011 Cadillac Escalade / Chevrolet Suburban / GMC Yukon – 2nd row (with 3rd row folded down) showing 3 tether anchors on bottom of vehicle seat
2010 Chevrolet Suburban – with lower anchors for 2C & 2P – which is problematic as if you install a car seat on 2P, you can’t fold that seat down to access the 3rd row.
See above that the late-2002 Suburban has a different arrangement for the lower anchors in the 2nd row.