No towing lock is a one-size-fits-all solution, so start by identifying your security needs. If you want to prevent someone from unhitching your trailer, choose a hitch pin or receiver lock and ensure that they’re the same size as the standard hitch pin you’re replacing. If you need to prevent someone from hitching your trailer to their vehicle, select a coupler lock instead. It’s also important to confirm the weight class of the towing lock, which should exceed your gross trailer weight and tongue weight.