Originally Posted by ScottGem
First, if you have no insurance you are driving illegally. All states require at least a minimum of coverage. However, if you have liability but not collision that is a different story.
If you were parked or stopped in the lot, then the owner of the trailer is 100% responsible. You should have gotten his insurance information at the scene and filed a claim with his carrier. Its still not too late to do so if you have the info. If not, was there a police report filed? If so, you can get the info from the police.