The 540# difference in these two trailers will not be noticeable, based on my experience towing two different sized Airstreams. This is because the weight difference compared to the whole rig (truck, trailer, and load) is very small and most of towing resistance is wind resistance, which is near identical with either trailer.
I'm guessing you have the Hemi 5.7 engine that we have in our 2012 reg cab Ram 1500
. Our truck is lighter, but there is plenty of power for the job. It will shift down for steeper grades which is no problem, and may have to drive in a lower gear than overdrive whenever the transmission repeatedly shifts for minor grade changes on the highway.