Ryan - I agree, and I did consult the stickers as I we started talking more seriously about it...
GVWR 7400#
Additional 700# (+/-) in the burb (people/gear/etc)
Total = 6700#
Suburban = 5700# (+/-)
Leaving 1,000# (+/-) available
Towing Capacity of my stock suburban 7,900#
Dry weight of TT 5600# (+/-)
Additional gear 1100# - 1600# (so let's use 1300#)
Total TT - 6900# (+/-)
Leaving 1,000# (+/-) available
GCWR - 14,000# - Standard is 11,500#
with the upgrades to the burb to be equivalent to the Z82 (K5L tow package)
GCWR 14,000#
TV 6,400#
Balance 7,600#
TT 6,900#
balance under weight 700#
So basically adding in the K5L towing - I am just at or just under the GCWR...
and to answer my own question - I need to look at a circa 4500# TT to be safe - or get a larger TV with circa 16,000# GCWR