Regarding up sizing to a HD truck. There are advantages like zero need for a wdh for most travel trailers (if you can get over the RVer mantra that those contraptions are somehow a requirement regardless of the tow rig).
What you won't gain is much if anything in the power department vs the big V8 1/2 tons and Eco Boost (6.2 GM, 5.7 Hemi and 3.5 EcoB will all pull about the same as the 3/4 ton gassers).
Bottom line, unless personal preference or skepticism about the longevity of the 2.7, your truck already does most of what the bigger engines does and the rest of the truck is the same.