Holy God man.
I am so sorry for your loss, I thought the USA was a safe place for plant & equipment, well the mother bookers that stole your gear will need asbestos boots when they kick the bucket, hope they root in hell. We have a name for ppl like that.... scum-bags. I have had a number of robberies this past year, mainly hand held items, blowers strimmers and so on. switching all trucks over to SLT like trucks its the only way. We now keep all our equipment in a warehouse with 24hr security. Before that I used to put on 4 x wheel clamps + 2 crash barriers on drive and a bulldog lock on hitch on each trailer. But I always emptied the trailer every night, I know its a pain in the arse but it just becomes part of your day.