I'm towing my whale of a teardrop with a 2018 Outlander PHEV. I've started a thread over in electrical secrets to share my experiences using it as a power source specifically: viewtopic.php?f=30&t=70360
I don't really have any experience with other tow vehicles or towing other trailers, but if anyone has any questions about my experience using it I'd be happy to try to respond intelligently.
I've made one trip with it so far, from Austin TX to Glen Rose TX (southwest of Dallas Ft Worth). At 65 mph, about 14 mpg on the way there with heavy winds and about 18 mpg on the way back. I had a couple of mountain bikes mounted off the rear of my trailer, so there was more wind resistance than "normal". And less tongue weight than I think would be ideal, but it was only noticeable at slow speed on rough roads. At highway speeds no problems at all.
My trailer is a (clone?) of a galvanized Thule EasyLine (125 I think, 4x7) with 12" wheels on a torsion axle. I am borrowing (i.e. "successfully stealing") it from my dad who bought it in kit form years ago.
I'll be taking it with the whole family to Pagosa Springs CO this summer, camping in Palo Duro Canyon state park on the way, and coming through Ruidoso NM and Carlsbad on the way back.