Did you weigh the tongue weight? I think we need at least 350 pounds for a good ride while towing. That might be more than the recommended 10-12 percent depending on trailer weight.
Pulling my trailer home, the only way I new it shifted was by the engine sound (or looking at the rpm). Really smooth shifting under moderate load. Don't think I ever got up to 4000 rpm.
I usually say that my ranger drives almost like my 2011 Taurus. Same weight, almost same power, just a little larger. With 300 pounds in the back the ride is almost identical.
I almost always keep the instant mpg showing. Even on cruse control. I have learned a lot about getting good mileage from watching it. Texas to Georgia: 800 miles, 27.3 mpg. A lot of "old" US highways, speed limited to 65. Ranger XL, 2-wheel drive, SuperCab. Used "regular" gas.
Here is what I have. I would not trust my 7000 pound trailer to aluminum. It is a 6-inch drop with large ball. If I were planning to tow a variety of trailers that were lighter I might consider the adjustable aluminum. The items in the picture are dedicated to my cargo trailer.
My experience was very positive, like Floyd's was.
Differences: I knew I had a load behind me when accelerating. Plenty of power, but noticeable difference. I have a lot of frontal area.
Agree with the bare skin on the hard plastic observation.
I had towing mirrors, but probably did not need...
Empty without trailer mine never goes into 2nd ( always 1-3 shift). With the trailer (in tow mode) it goes through all the gears. The shifts are VERY smooth.
Here is another picture of my Ranger with trailer taken from 2nd floor motel window. Averaged 15.7 mpg on the trip home (800-plus miles). Acceleration was slowed some. Brakes worked very well with the P3 controller.