I have the identical set up as you with tv and tt. I have 07 tahoe and 23ikss. a few items I would recommend: first and foremost you are getting close to danger zone in trans temp...I never get above 180. add a trans cooler (about $100) or so and will help. also the v8 is deisgned to run at 3-4000 rpms all day long, thats where it gets its power. however I would pull in 3rd with your tow haul turned in and your transmission wint shift as much. 65 is what I tow at and I dont ever use cruise control. I use the 4 pt equalizer hitch with built in sway control. I have thought about the hensley or pro pride but dont know if I want to spend thr money. thr 4 pt takes out alot more sway than what you are currently using and distributes weight nicely. i would also head down to thr cat scales fully loaded and with everyonr that typically rides with you to makes sure you wdh is distributing properly and you arent over kn your rear axle (I was close before I dialed it in) just some thoughts for you
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2014 Shamrock 23IKSS
2007 Chevy Tahoe 5.3L V8 with 3.73 rear end, Primus IQ Break Controller, and Equalizer Hitch
DW (Not allowed to say)
DD (3 year)
DS (6 months)
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