A couple of times a year I tow a 16' floater trailer with a YJ on top with my 04 Libby. The trailer weighs in at 1500 lbs and the YJ weighs in at 3500 lbs so I'm towing at the maximum limit of the Libby. Yes the fuel mileage goes out the window and steep hills are a killer
My Libby has a Mopar trailer towing package c/w tranny cooler and the trailer has electric brakes on a single axle. I had to add the electric brake controller, it's not part of the towing package. I choose to buy a Class 3 load leveling hitch to insure stable handling. I believe the owner's manual recommends burning 89 octane fuel (medium grade) and turning off the automatic transmission's overdrive.
If you're only towing this vehicle trailer the one time then I doubt you'll have a great problem, just don't expect to drive as fast as you do without a trailer behind you.