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As always, towing penalty should be about 40% where all else is the same. That last bit often overlooked: truck needs to weigh the same is one, and towing speed should be the same as solo. Use of cruise control makes for better comparison.
At this point in trucks life, getting repairs done plus all book maintenance to date is crucial.
At highway speeds with an aero penalty trailer, it takes very little to drop mpg like a stone where computer is confused.
Have you run a route of about 200-miles? Out and back? Think of it as the test track. From a truck stop with a Cat Scale. Apples to apples (not yet happening for you).
Trailer axle leaf suspension broken down and rebuilt? Axles aligned? Shock absorbers installed? Hitch weight verified? Etc.
So, past truck issues, both trailer and the lash up need to be gone over.
Just the WD setting with mine being off was worth over 2-mpg. At 55.
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