Mine was in the back of my truck. I ran the strap across the bed, wrapping it around the rear rack. I hit a good bump but never considered the strap could stretch enough to release.After a couple close calls, I've started using carabiners thru that loop to attach the strap to the hooks on the trailer. At least if it loosens up you don't lose the strap.
I'll also criss-cross the straps on each side ie strap to the back of the snowmobile/atv to the front hook on the trailer, and vice versa. Lot less likely to loosen that way.
Now I tie an insurance rope onto the steering assembly, just a square knot kn case something doesn't go as planned.