Saw this one and wanted to add #2cents..
Having had both the 2.7 and now the 3.5, I can say this.
The 2.7 will pull a Jayco 27RBOK without issue - for a long distance, and will get around 17 to 19mpg doing it. As long as its on flat roads, it'll attempt to stay in 5th, sometimes shifting out - depending on the speed your rolling and eventually shift back to 6 and 5th again.. It has a two/haul mode that opens up a bit more air controller and cooler info to the transmission and then "S" for sport - if you can call pulling a big trailer sporty - about all its good for is making engine breaking a little better.
The 3.5, which I have now, will pull the same load, in high gear - if you go 70mph, it'll be in 6th most of the trip, on occasion slipping to 5th or 4th to really get the load moving but, it is a little quieter as it has a lot more grunt... from down low to high, it does it with more uuumph... BUT.. you're going to be down in V8 land for economy - from 15 to 18mpg - which was excellent compared to my 5.4ltr... at around 8mpg.
I have tow packages on both, the 2015 2.7 didn't come with the trailer package, all of them have it now.. The 2016 I have in the 3.5 came with the automated backup, I never use it - it has trailer brakes as well and does really well.
Both have more power than my original 5.4 ltr even with the chip added - the 2.7ltr is half the motor, and more HP, the 3.5ltr is more of both torque and HP... for a little less mpg.
I had a hail issue on my 2015, ended up with a 2016 with a little bigger motor, and was happy with the 3.5ltr when I saw it would roll in 6th pulling the trailer 70Mph...
Great deal, and I agree - a major investment.
Hope this helps someone.. T
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