An LJ (TJ Unlimited) is rated to tow that, but I'd be hesitant to do so with one. It's just not the ideal tow vehicle. If you were going to do so, I'd recommend using some form of sway control to keep it in line.
But if you're going to buy a different Jeep to tow with, consider a Grand Cherokee. You ought to be able to pick one up used with a decent tow rating.
The WK2 (2010–present) is rated 7,400 lb for Hemi models and 5,000 lb for Pentastar models.
2006 Black Unlimited 6-speed, Rubicon Express 4.5" Long Arm Kit