Truck tool boxes

Only idea I have is locks. And I don't. Have an idea. Except "if you really want and need" security, think long and hard about how to "beef" the lock system. MOST commercial boxes have junk for locks, including the commercial service boxes. "A few seconds" with a crowbar will get into most of them. Frankly the best advice "might be" a padlock, or two on larger doors, with a welded cover box both for weather and added security........to reach up/ in and unlock. You can buy them "keyed alike". Watch some of the "lock picking lawyer" youtube videos. Some (many?) locks are junk
https://www.youtube.com/c/lockpickinglawyer/videos