Towing spec for any 1999 Jeep either 2.5 or 4.0 was 2000# but you might check your manual as I had red somebody said theirs was rated for 2500#. The big limiting factor is the short wheel base. Beyond that the current JKs have a maximum 32sq ft rating for the frontal area of an RV/trailer you are towing behind. Many RV trailers are going to be pushing twice that.
2011 JKU Sahara; Sahara Tan, Leather, 3.73, Auto, Hard/Soft Top, SpiderWebShade, Dead Pedal, Skid Row Foot Pegs, BFG KO2, 10a Wheels