I run one of these locks on my trailer although it is either in an improved campground or sitting inside a secured and monitored storage building. They aren't very secure.
Here's a link you've probably seen for one that seems like it might be pretty good but is pretty expensive; and if you read the comments I don't know if it would be worth it.
I do intend to replace mine because it is so easy to defeat - don't know with what yet. Also keep a pin lock on the hitch as well.