I drove many different kinds of semi's, trucks and trailers for many years but never used a tow dolly. (did use a converter dolly on 2 semi trailers)
Last fall I bought a 2016 Kia Sportage from Hertz Car Sales 140 miles from home.
I rented a dolly from U-Haul and towed the SUV home with my Chevy PU.
It was very easy towing and I had no problems, BUT every time I looked in the rear view mirror I was shocked that someone was tailgating that close! :)
I ran 65-70 mph most of the way home.
My best advice is make sure everything is latched/pinned/clamped/plugged in as it should be!
It would be easy to miss a detail, you might even make up a check list to work from.