Never met a Lady Bug I didn't like. You actually having them show up in your trailer uninvited while your trailer is not in use? I've never had a problem with them in or near my trailer. Now ants, that's another issue.
Had a major lady bug invasion on a recent camping trip ..... They were swarming and trying to find places to hide for the winter ......still vacuuming them out of the camper and truck cab. If you figure out another way to get rid of them let me know!!