You should have plenty of power with the 4.0L engine. The automatic transmission will make up a lot for the 3.55 gears. If you don't have tall tires you should be fine. Not having trailer brakes is the biggest concern but at 2400 lbs towing, it will not be too bad. Just give yourself plenty of room to stop. Make sure the trailer tongue provides enough weight to the rear to make sure the rear tires have decent traction during braking. You don't want to jack knife in a quick stop.
I have towed all over the country including over the Rocky Mountains on I-70 with a combined trailer load of 3500 lbs plus 800 lbs on the bed. I don't feel under powered with my Ranger with 4.10 gears and 31" tires. That is running with a manual transmission. I do have trailer brakes and helper air springs to keep the rear from sagging.
2002 FX4 Bright Red Supercab 4.0 SOHC, manual 5-spd & Tcase, 33" BFG MTs, K&N air filter, Modified air box inlet, Gibson SS cat. back exhaust, Bama flash, Hidden Hitch round receiver, Rear helper air springs, Electric trailer brake controller, Line-X bed liner, WAAG bar with KC lights and Wildernest shell.