You could take an anywhere from 10-50 mile jaunt with your new truck and trailer and figure out the answer to both questions (and actually be prepared with the trailer for a big road trip), or wait for the onslaught of nonsensical answers mixed in with a splash of objectivity and then sort through it.
When in reality, does it make a difference anyway? Gonna cancel the trip if it gets a couple mpg less?
Hint: It will get very similar mileage to your previous truck. Unless there are some extenuating circumstances.
2016 Ram 2500, MotorOps.ca EFIlive tuned, 5” turbo back, 6" lift on 37s
2017 Heartland Torque T29 - Sold.
Couple of Arctic Fox TCs - Sold