How do you secure your trailer?

[JimD]

Buddy wants to leave his boat and trailer next to a friend's home at mid coast.

Fairly safe but....

What is the best way that you have found to secure your trailer?
Wheel lock?
Trailer cover lock?
Other ideas?

Thanks,

Jim

[kenny]

Lock it every way you can but if someone wants it or part of it they'll get it.
tongue lock, heavy arse chain and lock....