you will be fine occasionally towing with a half-ton.
I have at least a 2k lb trailer that I put my cherokee on. I pull with a 2500 ram van with a 318 V8 and have no problem holding 65-75 mph although I prefer to keep it at the lower end of the spectrum (my trailer kinda sucks). Last trip, I calculated 12.5 mpg on the way home from drummond, the diesel guys in my group towing similar rigs were only getting 14mpg.
you should be absolutely fine. dont let the big diesel guys talk you out of it. the only upgrade I might recommend outside of the standard brake control, might be airbags on the rear----but not necessary at all