We just had a Habitat for Humanity truck with the name emblazzoned on the side stolen from their own locked yard. The thief ran down the gate and fence getting out. Recovered in 48 hours thankfully. I did a google search on such a thing and found that in just the last two years, several Habitat trucks were stolen.
Thiefs will steal anything and are able to get around most locks. Alarms are a good thing if the trailer is parked next to the hotel room.