I towed a 6,000lb trailer (27' with a 3,200lb Christmas Tree on it-don't even ask lol, it was a 35' tree) through the Big Bear, CA area (5-7 thousand feet altitude) and then all the way to San Diego (150 miles) with no problems. That is with my lifted KJ with E-range 31" tires, already costing me power. The KJ did fine, brakes were great too (trailer had no brakes). Never went over 50 mph, mostly due to the lack of trailer brakes, however, the trailer never swayed and I never felt like I had too little power nor a significant lack of braking power. This was not the most responsible tow (was originally going to use an F450, but it broke down the night before), oh and I forgot to mention it was raining. We did have 2 spotter cars, one in front and back because the tree was a lane and a half wide, but overall the KJ did fantastic! Pulled some steep (6-8%) grades too! I have both an aux trans cooler, aux power steering cooler, and the mechanical+electrical fan, and in the mountains my 45RFE trans never exceeded 210 degrees on the uphills (autometer trans temp gauge), and my engine never exceeded 214 degrees. I do have the hayden fan clutch though which engages at 206 degrees, compared to the mopar one which engages at about 235 degrees.


