Join Date: Mar 2006
Location: Helsinki, Finland - on the European side of the Atlantic
US tow ratings are somewhat lower than here across the ocean. The list provided above is pretty complete - the most important part IMO is trailer brakes. XJs (and ZJs) have crappy brakes, they will NOT stop a heavy trailer efficiently and safely if it's anything more than around 2500lbs..
XJs here in Europe (2.5 litre diesel and 4.0 gasoline 4wd versions) are usually rated for around 6500lbs (2700-3000kg) towing capacity for trailers with brakes; trailer without brakes and it drops to around 1000-1500lbs. One thing to consider with an XJ is that it has fairly short WB, which does result in a bit "snaky" handling with heavier, longer trailers. The 4.0 can pull suprisingly heavy trailers fairly easily, but it's not the most ideal if you're looking at a bigger camper.
My comfort zone would be around 20ft./ ~3500lbs gross weight trailer with brakes, class III weight-distributing hitch for daily towing. I know for a fact you can pull 5500+ lbs all day long without issues, but you're not gonna enjoy it - especially if there are a lot of uphills and downhills.
1998 Grand Cherokee 5.9 LX daily driver, 1.75" BB, 32" KM2s, HPD30 Eaton e-locker/D44a stock LSD, 4.56 gears, custom- fabbed tube bumpers and tube fenders,...
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1990 XJ Limited (4-door), 4.0 I6, AW4, NP242, ***rolled and totalled @ 165k miles***
1990 XJ (4-door), 4.0 I6, AW4, NP242, PBR 42" tires, Unimog 404 portal axles, 110" WB, full cage + uniframe completely rebuilt, front 3-link + panhard / double triangulated 4-link rear,... ***SOLD***