I love rehashing old threads, so:
I hauled my Ranger 500 w/ plow on my 6 x 15 open trailer last week, behind our '12 V6 Laredo X. I'd guess the weight between 2500 and 3000 lbs, so not max weight. And it's an open trailer, but the back ramp is like a dang airbrake, so it really drags, even when empty. It was part back roads, part highway, and I averaged 14.5 mpg.
It pulled very well, had no power issues, and braking was fine. However, due to being lighter than my Avalanche, I noticed a lot more sway from wind. And I think I may get a drawbar with a little drop to it. My Avy's hitch actually sits lower, and the trailer angle is perfect. On the WK2, it's so high, the jack barely goes up enough to mount it. The trailer leans back a little, so there's less weight on the ball, which could be part of the swaying issue, though it was never out of control. Another drawback to the lighter weight was braking on roads that were unplowed. The trailer wanted to push me a bit, where the Avy could care less on worse roads.
Save for those little issues, I was pretty happy with it. Definitely does better than our old '02 GC ever did, lol. I think I will stick to the Avy when the roads are bad, but in good weather the Jeep can save me a little gas! I think longer highway trips I could do a little better than 14.5