My 2003 Explorer Sport Trac 4WD automatic tows the 2720SL fine, but I'd suggest the WDH. I towed a few times without one, and there was quite a bit of sag -- added the WDH and I'm not only level, but it's a LOT more comfortable on the road.
I DO wind up getting a bit slow in some of the Colorado mountains, though, especially some place like Rabbit Ears Pass.
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