I love opinion related questions like this. You have a 2001 4.0 SOHC 2WD.
You now have the opinions of 2 3.0 owners, and the owner of a 4.0 OHV.
Here is the opinion of a 4x4 4.0 automatic owner...
I have towed 3497 pounds of truck batteries(scale ticket) on an 1800 pound tandem trailer, with 557 pounds of batteries in the bed.
5297 pounds on the trailer, and 557 in the bed, for a total of 5854 pounds. The truck did well on straight aways, and accelerating. Hills were slow, but I could maintain speed...
Look in your owners manual, and look up the towing capacity of the 2WD.
The 4X4 automatic has much higher towing capacity than the 4x4 5 speed..., so you need to be sure, before you tow anything. Make sure if you do tow it, the trailer has brakes, you will need them.