I use an '07 Dodge 1500 with the 5.7L, tows the xj great on my 20" flat bed, it also hauls a 26' fifth wheel and the 22' enclosed trailer for the quads, had ~9500 max with the fifth wheel loaded down, towed it great from Oregon to New York, and Oregon to Texas.
Wish I had gotten the 2500 diesel for miliage and some more power though. Sometimes going through the mountains I really wish I had the 610 ft-lbs instead of my 375 or whatever the hemi has.
2013 JK 4-door Sahara in Dune, stock for now
2010 JK 4-door Black, bead locks, 37's, 5.13's, mopar front bumper, warn rear bumper
1998 Cherokee, 33's. 4.56 gears, locked front and rear
2007 Dodge 1500 Laramie, Hemi, 20's, 33's, all the goodies.