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Dear gawd. It's a brick! a 2000lb brick!
First observation: You're moving a 4700lb SUV with a 3.6l V6 (unless there's other variants), which is barely adequate for the job. Then you add another 2000lbs in the shape of a huge brick. You're lucky you're getting 10mpg. You're lucky you can pull it at all.
In this case, unlike most others, a bigger engine would probably get better fuel economy. You don't have the excessive amount of torque necessary to move such a big load, so the engine has to make up for it by revving higher than a V8 would, and throwing your engine out of the efficient operating zone. So you're pissing away extra gas to compensate.
The weight is a bit of a concern as well. An extra ton added to any vehicle is going to be hard on the fuel mileage. But you can't do much about that or about your engine, unless you want to change vehicles and or the trailer. I'm assuming not...
So. You're down to aerodynamics, basically. Do something about that "brick" shape....more than the slight boat tail you've got pictured. Fix the front. Fix the rear.
Said simply, though it isn't going to be a simple job. Might not be worth the time and effort, unless you do a lot of driving with it.
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