Locking your trailer goes beyond just locking the doors and windows, although these are important measures to take. In this case, consider a lock that goes around the kingpin. There are a variety of options available, with the two most popular locks being a pad lock and a cylinder lock. Both go over the kingpin.
The cylinder lock, however, has a locking mechanism that keeps it in place. Some cylinder locks even come with a special key that can’t be duplicated. You can also replace the handle with a keyless handle lock with a keypad and keyfob for increased security and convenience.
You may also want to consider getting a boot, which covers the wheel and prevents it from turning with an extension. The boot cover also prevents lugs from being stolen from the wheel. Thieves may try to change tires on the camper, even with a boot cover, so be sure to choose one that covers the lugs so tires can’t be changed.