My Brian James trailer has been stolen twice.
Its kept at the Mother in Laws, in a very quite rural area.
Luckily I got it back each time, but decided it wasn't going to happen again.
Reversed trailer very tight against a wall, then chained it to that wall, security bolts through the brick work, almost inaccessible chain around the chassis and a good lock.
Datatag here
On other side from wall Bulldog winter wheels.
a sign stating very clearly that the trailer was covered by CCTV
and finally a triple lock hitch from Indespension.
Been two years now, no further issues.