Im geared 4.88 with 35's and a 2" lift and it tows fine out of overdrive. big climbs you will be hanging out with the truckers doing 55mph but most the time 65-70mph is no problem and pulling about 3k rpm. You will loose speed on steep inclines but when you hit about 2500-2600rpm it will hold there and maintain that speed.
Havent stepped up to an auxillary trans cooler yet but trans temps never got higher than they do on a typical 4wheeling trip.
I also intentionally towed it up hiway 80 that is steep and twisty and never lets you get any momentum going. All switchback for about 15 miles and it did great with that as well.
I am planning to run an edelbrock supercharger just waiting till this fall to pull the trigger. The jeep will never be great at towing but it can be good at everything. That what I like about the platform. It isnt great at anything but it can be good at almost everything.
the trailer is a Starcraft AR-One 15RB