1/2 the time I am a lazy, just winch the car on the trailer, wrap a chain around the rear axle, and tighten the winch and go.
Mostly just parts cars, because after fighting them to get them on the trailer, I just want to go home.
I do watch the mirrors like a hawk on the way home, to look for movement, and check all tightness anytime I stop.
I have not lost one yet, once in a while the winch cable will get a little slack. But most hauls are short distance, that I pick up local.
I always use 1 or 2 chains around the rear axle too, and 2 come-alongs on the front. My tows are often 500-1000 miles each way. I want the car and trailer to stay together in a wreck, rather than the car coming at me through the back of the truck.
Just my IMHO, too many guys here are thinking just of keeping the car from moving around in normal driving and not thinking about emergencies. D rings are gonna rip right out of the floor of most trailers in a wreck.