I have both a 15 super crew 4x4 with the 2.7tt and a 16 super crew 4x4 with the 3.5tt. I use the 15 for work have almost 80k miles not 1 issue, 22mpg. It also has the tow packag, I’ve towed a car on a flatbed with zero issue plenty of power. The only compliant I have on the 2.7 is that stupid auto stop which shuts you down if your stopped at a light. You can hit a button to disable each time u get in, pain in the ass! The 3.5 doesn’t have this but I’ve read 18 and beyond all will that this stupid feature.
I've read some posts about people pulling the switch out of the dash and putting a jumper wire in to make the vehicle think it's depressed at startup. Also, others are putting an inline switch under the dash to mimic the same thing.