Just going from the one pic quoted by Euromodder it looks to me like your trailer is not taller or wider that the Jeep so frontal area not increased. There is a large gap between the two. You could add a lightweight fairing to the front of the trailer and/or divider board up over the ball to mute cross winds bleeding over and contributing to wake.
The blunt rear without tapering isn't helping. It's possible to build out the sides to swallow the fender with tapering to the top for smooth transition and angling to the rear for clean separation. Above the fenders would add some frontal area but the Cd reduction may be worth it. Again, shadowed behind the Jeep it may not be much overall Af increase.
Good luck!
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