Go with a diesel pickup and you'll never have to worry about it. Most trailers are probably 1500 to 2000 lbs; add that to your CJ, 2500 to 3000 and add gear and provisions for the trip. You better be able to pull 6000 lbs and stop it comfortably. Your Ranger just won't make the cut.
'81 Scrambler w/ FI 360 AMC, 33x12.50 BFG M/T's, 5" of lift, ARB'd Dana 44's F & R, Dana 300 clocked & twin sticked w/4:1, Warn XD9000i, etc...
2002 Grand Cherokee Limited, 2008 Overland Grand Cherokee, a 1976 CJ-7 in pieces and 3 more off-brand 4x4s...............