Best way to lock up utv

I have 2 dozen ATV's running around the Western US, 2 per flatbed trailer. The field crews that use these ATV's stay in motels. All we do is run a length of chain through the ATV frames and around the trailer steel sides then use a lock to secure the chain.

In the past 15 years the only ATV that has been stolen was in Tucson AZ and it appears that the crew forgot to chain this one up. Its running mate was still on the trailer chained up.

We leave ATV tire repair and emergency stuff in the soft bags setting on the ATV's and have never had anyone mess with that stuff. Some times the trailer with bikes is left in the motel parking lot with just a tongue lock attached and no one has ever drug off a complete trailer set.

Are you using an enclosed trailer? That would be a good start.
If not, can you take the wheels off and chain it to the trailer?

DOITHARD is correct.if someone really wants it, they will probably take it. Deterring and slowing down the thieves is about all you can do.

A cheap motion activated alarm on a dedicated battery and a round chambered if the alarm does not scare off potential thieves. Loss of property is not worth taking a life and it is not worth risking your life to protect your property, but they don't have to know that.

Recommend a guard dog remain with the UTV for the duration of the trip and do what DOITHARD suggests.

IMHO, have it insured. If someone wants to take it, doesn't matter how secure you have it.