Towing capacity has more to do with a vehicles weight and braking capability, and lastly the transmission, than the engine.
We tow a 2000 pound Coleman pop-up in the mountains at high altitude (8000 - 1000 feet) with our 99 XC with no problems...the trailer does have electric brakes.
I don't believe the load leveler is neccessary either (though it might be nice to have), as no matter how heavy the entire trailer is, you are limited to 200 pounds (I think) tongue weight...trailers are balanced on their axles so as to keep the tongue weight reasonable (though you always want SOME positive weight).
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