The hardened shanks will slow them down, even with a bolt cutter. They will need a real big one... but cutt'able. Anyone who works in an industrial maintenance dept knows how to get through a lock... They call it "The Master Key".... About a 4 foot long bolt cutter
Shank exposed or not, a battery powered grinder with a cut off wheel on it will cut through lock or shank in no time. Just it makes noise.
Like this one
If they want it bad enough, there is no lock that will stop them. Locks are for honest folks or at least those with some level of self worth. The low life that steals someone's camper, a lock will not matter. It will however slow them down to give you a chance and at least tell your insurance agent, it was locked.
Stay warm down there is Fla. Send some heat up our way...
John