well, you don't list the model of trailer and you don't list the specs on your Yukon, other than year and engine size.
model of trailer would help a lot and so would knowing what rear end ratio your Yukon has, is it 4x4 or 4x2, HD factory tow package or not.
also, what brake controller and WDH are you planning on getting?
and Zoe the Wonder Dog(R.I.P.)
'07 Roo 23SS pushing an '07 Chevy Avalanche
Equalizer WDH and Prodigy BC