I have a 2015 Silverado with the 5.3 engine. Once in a while I pull a 5000 pound tractor on a trailer or pull a 12 foot livestock trailer. Mostly concerned about pulling a 6000 - 6500 pound Jayco travel trailer down the Interstate at 60 mph which I have done easily with the 5.3. Chevrolet dealer says I should buy the 2.7 engine in a new Silverado. Seems small to me. 5.3 has around 355 horse power while the 2.7 with a turbo has 310. I really question the decision to buy the 2.7 engine. There is hardly any difference in miles per gallon. The 5.3 runs about $1500 more as an individual item. I have viewed a youtube video of the development of the 2.7 and it does look to be a tough engine. Just don't know if it can compete on the interstate. Anyone running a 2.7 and pulling a moderate load? Thank you.